Fossil apes from the eastern Mediterranean are central to the debate on African ape and human (hominine) origins. Current research places them either as hominines, as hominins (humans and our fossil relatives) or as stem hominids, no more closely related to hominines than to pongines (orangutans and their fossil relatives). Here we show, based on our analysis of a newly identified genus, Anadoluvius, from the 8.7 Ma site of Çorakyerler in central Anatolia, that Mediterranean fossil apes are diverse, and are part of the first known radiation of early members of the hominines. The members of this radiation are currently only identified in Europe and Anatolia; generally accepted hominins are only found in Africa from the late Miocene until the Pleistocene. Hominines may have originated in Eurasia during the late Miocene, or they may have dispersed into Eurasia from an unknown African ancestor. The diversity of hominines in Eurasia suggests an in situ origin but does not exclude a dispersal hypothesis.
The origin of the hominines is among the most hotly debated topics in paleoanthropology. The traditional view, ever since Darwin, holds that hominines and hominins originate in Africa, where the earliest hominins are found and where all extant non-human hominines live. More recently a European origin has been proposed, based on the phylogenetic analysis of late Miocene apes from Europe and Central Anatolia1,2,3 The fossils described here attest to a lengthy history of hominines in Europe, with multiple taxa in the eastern Mediterranean known for at least 2.3 Ma4,5,6,7 Our phylogenetic analysis, based on the new specimens described here and a large sample of other fossil and extant hominoids (Supplementary Note 1, Tables 1, 2), supports previous research confirming the hominine status of the eastern Mediterranean apes2,3,8,9,10,11,12,13,14,15,16,17,18,19,20 Our most parsimonious phylogenetic results suggest that hominines in the eastern Mediterranean evolved from dryopithecins in central and western Europe, though there are alternative interpretations21,22,23,24. Either way, the oldest known hominines are European. They may have dispersed into Europe from ancestors in Africa, only to become extinct22 However, the more likely and more parsimonious interpretation is that hominines evolved over a lengthy period in Europe and dispersed into Africa before 7 Ma.
For some time, the only known late Miocene ape from Anatolia was Ankarapithecus, which is alternatively described as a stem hominid or a pongine25,26,27, but not a hominine. It is easily distinguished from Ouranopithecus and Graecopithecus from Greece and Bulgaria25,26,27 In 2007, a new species of Ouranopithecus was described from Çorakyerler in central Anatolia28. Since then, thousands of vertebrate fossils have been recovered at Çorakyerler, including a well-preserved ape partial cranium29 (Fig. 1) The O. turkae holotype, a fragmented palate, was originally distinguished from O. macedoniensis in its shorter premaxilla, narrower palate, morphologically similar (homomorphic) upper premolars (as opposed to P3 being more triangular than P4), smaller male canines and possibly larger size28. However, recovery of the new cranium and our reanalysis of the published material requires a reassessment of this conclusion and justifies the naming of a new genus of Miocene hominine. Anadoluvius is distinguished from other eastern Mediterranean apes in the palate, face, neurocranium, mandible, dental root and root canal configuration, and in dental crown proportions and morphology. Ouranopithecus, Anadoluvius and Graecopithecus may be members of an evolving lineage, with the new data from Çorakyerler further supporting the hominine affinities of these taxa. Hominines were more diverse in the late Miocene of the eastern Mediterranean than previously understood, with a known range from at least 9.6–7.2 million years ago. This conclusion, along with the recent reassessment of the Pyrgos Vassilissis and Azmaka specimens reveals a hitherto unappreciated diversity of late Miocene apes in the eastern Mediterranean.
Results and discussion
Order Primates Linnaeus, 1758
Infraorder Catarrhini Geoffroy, 1812
Superfamily Hominoidea Gray, 1825
Family Hominidae Gray, 1825
Subfamily Homininae Gray 1825
Anadoluvius gen. nov.
Ouranopithecus Bonis and Melentis: Güleç et al. 28
Anadoluvius turkae comb. nov. Sevim Erol et al. 2023.
Anadolu is the modern Turkish word for Anatolia and Anatolian.
CO-300 (RM2); CO-305 (male mandibular fragment with RC-M1); CO-710 (female mandibular fragment with RP3-M2); CO-2100 (RI1); CO-2800 (female partial cranium with RC-M2, portions of the right maxilla, maxillary frontal processes, frontal maxillary processes and most of the frontal bone) (Fig. 1; Supplementary Figs. 3–5) Detailed specimen descriptions and a revised diagnosis for this new taxon appear in the Supplementary Notes 2, 3. The hypodigm is curated in the Department of Anthropology, Ankara University. All samples used in this analysis are listed in Supplementary Tables 1, 2. Measurements are provided in Supplementary Tables 3, 4. Supplementary Note 4 presents the results of a comprehensive quantitative analysis of the Anadoluvius hypodigm. Supplementary Note 5 provides details of the phylogenetic analysis. Supplementary Note 6 provides historical, geological and biochronologic background.
The CO-2100/2800 partial cranium (Fig. 1, Supplementary Figs. 2, 3) was recovered with some crushing and displacement of several broken pieces (see SM for restoration details and detailed description.) The frontal bone is nearly intact, missing only portions within the temporal fossa and the squama approaching bregma. This distinguishes it from the most complete facial specimen of Ouranopithecus (XIR-1), which is broken just beyond the superior orbital margins and preserves almost nothing of the frontal squama (Supplementary Fig. 2). Though damaged, the position and orientation of the premaxilla is better preserved in CO-2100/2800 than in CO-205 and Ouranopithecus (XIR-1 and RPl 128), confirming previous interpretations of a stepped and overlapping morphology in these specimens1,2,3,11,13,14,15 (Fig. 2).
The premaxilla of Anadoluvius is short and vertical compared with Pan, Pongo, and australopithecines, and is most like Gorilla and dryopithecins, being relatively short in the alveolar portion but expanded nasally to overlap with the palatine process of the maxilla (Fig. 2) The incisor alveoli are positioned along the mesial transverse plane of the canine crowns (Figs. 1, 2; Supplementary Fig. 5) In two specimens of Ouranopithecus (RPl 128 and XIR 1) the upper incisors are well anterior to the canines (Supplementary Fig. 5) In NKT 89 the premaxilla is severely damaged, but the posterior edge of the lateral incisor appears to be aligned with the anterior transverse plane of the canines, a position most like Anadoluvius. The frontal bone of Anadoluvius differs strongly from that of Ouranopithecus in the smooth biconvex squama of the former, contrasting with a broad concavity above glabella in the latter. The superior orbital margins of Ouranopithecus are broad, rounded and slightly projecting while they are sharp and flat in Anadoluvius.
A principal components analysis based on mandibular measurements available for Graecopithecus, Ouranopithecus and Anadoluvius is presented in Supplementary Fig. 6 and Supplementary Data 1). The Çorakyerler, Nikiti 1 and Graecopithecus mandibles are separated from each other, especially along PC 2, and from Ouranopithecus, illustrating the diversity present in these samples. Supplementary Data 1 includes the data matrix, summary statistics, scores, and loadings.
Anadoluvius, like Graecopithecus, and NKT 21, has a relatively narrow mandible compared with the combined sex sample of Ouranopithecus (Supplementary Fig. 7a). Supplementary Fig. 7b compares relative mandibular corpus breadth at each tooth position (P3-M2) in Anadoluvius, Graecopithecus, and Ouranopithecus. Anadoluvius is similar in mandibular robusticity at the premolar level but at the level of the molars it matches or strongly exceeds the maximum value in the other taxa (Supplementary Fig. 7b).
There is diversity in mandibular robusticity (breadth relative to height) and in dental size ratios as well among the samples of eastern Mediterranean apes (Supplementary Fig. 8a–e). Anadoluvius is distinct from Graecopithecus in all mandibular and dental ratios. Anadoluvius falls beyond the range of variation of Ouranopithecus in relative corpus breadth at M1-M2 (Supplementary Fig. 8a) and M2 size (Supplementary Fig. 8d). Interestingly, NKT 21 falls outside the Ouranopithecus range in relative P4 length and M2 size (Supplementary Fig. 8d–f). It has a relatively short symphyseal-molar distance, at the 25% quartile for the Ravin sample, and a relatively robust mandible at M1-M2, at the 75% quartile for Ouranopithecus (Supplementary Fig. 8a, c). In Graecopithecus the symphysis is positioned closest to the molars, just barely in the range of the Ravin sample. In summary, in most quantitative comparisons Anadoluvius is distinguished from Ouranopithecus and Graecopithecus.
Tooth roots and enamel thickness
Figure 3 shows the root and root canal morphology of CO-300, the male mandible of Anadoluvius (see Methods for segmentation details). Unlike Ouranopithecus, the distal roots of P3 to M1 in Anadoluvius and Graecopithecus11 are single fused roots with two root canals (Fig. 3 and Supplementary Table 5).
Like Ouranopithecus, Anadoluvius has thick enamel. Supplementary Fig. 9 illustrates ranges of variation in relative enamel thickness (RET) in the M2 of Miocene, Plio-Pleistocene and living hominoids. Anadoluvius has thicker enamel than most Miocene apes, falling at the upper end of the range in Afropithecus30 Its RET is greater than RPl 641, an M3 of Ouranopithecus. The relationship between M2 and M3 RET is variable in hominoids30, but their ranges of variation always overlap. Anadoluvius falls well above the ranges in extant hominids and within the A. afarensis and A. africanus 75% quartiles.
The results of an ANOVA examining lower canine relative size is presented in Supplementary Table 7. In canine size relative to the geometric mean Ouranopithecus is significantly different from extant African apes in having relatively small canines. The relative size of the CO-305 mandibular canine (0.53) is equal to the mean of Ouranopithecus males and at the low end of the range of variation in Pan males and females.
Canines are small in the Balkan/Anatolian sample compared with other fossil and extant apes including Ardipithecus, being more consistent with the ranges in Australopithecus. The ratio of lower canine to M2 size (canine maximum ln x bd/M2 maximum ln x bd) in Anadoluvius is lower than in any male and most females except Australopithecus (Supplementary Fig. 10a). The Balkan/Anatolian specimens have relatively small canines compared with African apes when scaled to the individual geometric means (Supplementary Fig. 10b and Supplementary Tables 6, 7; geometric mean of 12 variables). Scaled M2 size is large and beyond the range of variation of African apes in Graecopithecus, Anadoluvius, and Nikiti 1while Ravin de la Pluie Ouranopithecus is intermediate between the other fossil apes and Gorilla (Supplementary Fig. 10c). Canine size is compared to each tooth position in Supplementary Fig. 11a, b.
The results of a cladistic analysis using a data matrix of 112 characters and between 18 and 23 taxa are presented in Fig. 4, Tables 1, 2 and in the supplementary materials (Supplementary Figs. 12–14; Supplementary Data 2, 3; Supplementary Note 5). All four cladograms are strict consensus. The analysis was run both with all characters unordered and 21 of the 112 characters ordered (see Methods and Supplementary Note 5 for character matrix assumptions). Both analyses yield similar results. The tree topologies are identical, and predictably the tree values are lower in the analyses using ordered characters. All but the cladograms that include the taxa with more than 80% missing data recover a clade that includes Eurasian apes and hominines to the exclusion of pongines and stem hominids (Fig. 4). The potential problem of using data from published sources as opposed to direct observation is illustrated in the results for Sahelanthropus. This taxon, universally attributed to the Homininae and most commonly to the Hominini, is never recovered in these positions in these analyses, being consistently a stem hominid. Sahelanthropus could be coded for 72% of the characters. The potential for coding inconsistent with the criteria used to code other taxa is therefore larger than for Orrorin, which is also coded from the literature, but for which only 29% of the characters could be coded.
We mapped synapomorphies and Bremer support values onto two consensus cladograms (Supplementary Figs. 12, 13). Table 1 lists the hominine synapomorphies of the cladogram (ordered and unordered) with the fewest missing data (18 OTUs). A phylogeny consistent with a large majority of the cladograms presented here appears in Fig. 5.
Supplementary Fig. 14 shows the results of the analyses of all four taxon sets with all character states ordered. Unlike the unordered and partly ordered analyses, the cladograms with differing OTUs vary widely. The 19 OTU (including Sahelanthropus) fully ordered analysis is consistent with previous ones while the 18 and 20 OTU analyses result in a pongine clade including all European and Anatolian taxa, which contrasts with all previous cladistic results from analyses with large data sets and numerical cladistic methods (e.g. TNT, PAUP, etc). The 20 OTU analysis includes several other unconventional results such as an Orrorin-Anadoluvius clade that, along with Ouranopithecus as the sister to pongines, and a pongine clade that includes all European and Anatolian taxa. The 23 OTU analysis remains highly unresolved. Given the diversity of results of these all ordered analyses and the broader consistency of the analyses in which the data matrices were either unordered or partly ordered, we consider the latter to be more reliable (see Methods for a discussion of our rationale on ordering character states in this analysis).
The consensus cladogram with the three taxa represented by <20% of the character matrix (23 OTUs) is uninformative, given the low level of resolution. The cladograms resulting from the unordered or partly ordered analyses, which exclude these taxa (Chororapithecus, Samburupithecus and Graecopithecus) all recover a clade that includes Anadoluvius and Ouranopithecus as sister taxa, which in turn is either the sister taxon to the dryopithecins or in an unresolved polychotomy with the dryopithecins and the crown hominines. Nakalipithecus, which has been interpreted as a potential ancestor of Ouranopithecus, is outside the crown hominids in this analysis, as suggested elsewhere1,31 Ankarapithecus is identified as a pongine and the widely accepted Pan-hominin clade is supported as well.
Ouranopithecus, Graecopithecus and Anadoluvius share a suite of derived characters of the jaws and dentition that support their status as a distinct clade. Although Graecopithecus could not be included in the analyses that yielded well resolved phylogenies, due to its many missing data (90%), all previous analyses of Graecopithecus associate it phylogenetically with Ouranopithecus1,2,3,5,11,13,15,32. The core attributes of the Balkan/Anatolian late Miocene apes are large, thickly enameled molars, transversely robust mandibles, small canines, and large size. However, among these taxa there is diversity. Graecopithecus is distinguished from Ouranopithecus (contra 35) in its relatively large M2 compared with both the M1 and corpus breadth, its more vertical mandibular symphysis and in details of root morphology1,11,15 Anadoluvius has the same lower dental root formula (P3 to M1) as Graecopithecus and both differ from Ouranopithecus. The frontal bone between the superior orbital margin and the anterior temporal line is preserved in XIR-1 (Ouranopithecus), which is sufficient to show that it was more vertically oriented than in CO-2100/2800. Anadoluvius is further distinguished from Ouranopithecus and other non-hominin hominines in having mesiodistally shorter canines (as was probably the case in Graecopithecus based on canine root size and shape) that lack mesial grooves and lingual cingula (unknown for Graecopithecus).
In quantitative attributes, the PCA (Supplementary Fig. 6) illustrates the overall distinctiveness of Anadoluvius compared with Balkan apes. The male Anadoluvius mandible CO-300/305 is distinguished from male Ouranopithecus in many metric comparisons (canine-M2 ratio, canine/geometric mean, relative mandibular breadth, symphyseal-molar distance, relative P4 length and size, and relative P4, M1 and M2 size (Supplementary Fig. 8a–f). Anadoluvius is distinguished from male Ouranopithecus in canine size relative to postcanine tooth size at every tooth position for both upper and lower tooth rows (Supplementary Fig. 11). Anadoluvius is distinguished from Graecopithecus in relative mandibular breadth, symphyseal-molar distance, P4 length, M2 relative size and M2 size relative to corpus breadth (Supplementary Fig. 8). In addition, the mandibular arch is wider and relative mandibular breadth larger at every dental position in Anadoluvius (Supplementary Fig. 7). Unfortunately, Nakalipithecus is insufficiently preserved to be included in most of these quantitative analyses, which are scaled using the geometric mean. Nakalipithecus lacks one or more of the quantitative attributes needed to generate the geometric mean used in this analysis. We ran an analysis of M2 size relative to mandibular corpus breadth at the level of mid M1, which are data that have been published for Nakalipithecus. In this ratio the Nakalipithecus specimen, which is probably male, falls within the range of gorilla females, Pan of both sexes, and female Ouranopithecus, outside the range of gorilla males, Ouranopithecus males, Nikiti, Graecopithecus, and Anadoluvius (Supplementary Fig. 8f).
Ouranopithecus and Anadoluvius lack shared derived characters of the pongines (greatly elongated premaxilla substantially or completely overlapping the maxillary palatine process, expanded zygoma, tall orbits, narrow interorbital space, reduced or absent ethmoidal frontal sinus, circumorbital costae.) There is no evidence for their inclusion in Ponginae.
Ouranopithecus and Anadoluvius share with dryopithecins (European middle and late Miocene apes with affinities to Dryopithecus) a series of characters found among hominines1,2,3 These include a ventrally rotated palate, a stepped subnasal fossa, broad, flat nasal aperture base, short nasal bones, nasal aperture apex superior to the infraorbital margins, robust lateral orbital pillars, frontal sinus expanded below nasion, incipient supraorbital torus, more horizontal frontal squama1,2,3 The phylogenetic significance of some of these shared attributes is disputed, particularly concerning the dryopithecins9,24. However, there is broad agreement that Ouranopithecus shares enough derived characters with hominines to warrant inclusion in that taxon1,2,3,8,9,10,11,12,13,14,15,16,17,18,19,20 (Table 1).
The phylogenetic results presented here regarding Ouranopithecus and its sister, Anadoluvius, are consistent with many previous analyses1,2,3,8,9,10,11,12,13,14,15,16,17,18,19,20 They are robust in terms of the number of synapomorphies and Bremer support values for many clades (Supplementary Figs. 12, 13). The results also recover the widely accepted relations among crown hominids and hominines and relations within all fossil clades. The Bremer support values for the hominid clade as defined here (15-16) are extremely strong. The hominine clade as defined here is moderate to strong (2-3), and very strong (4 to 8) for the pongine clade (Supplementary Figs. 12, 13). European and eastern Mediterranean apes are classified as hominine in three of four consensus cladograms. It fails to be resolved only in the analysis of all 23 taxa, including Samburupithecus, Chororapithecus and Graecopithecus, missing 82%, 87% and 90% of the data respectively. The latter cladogram also fails to distinguish between pongines and hominines.
The relations among the dryopithecins are consistent with most detailed analyses focused on this group, as are the relations within the Asian clade (Ankarapithecus, Sivapithecus and Pongo) and the crown hominines1,2,3,8,9,10,11,12,13,14,15,16,17,18,19,20 The consistencies of these cladograms in many details with previous research lend credibility to these results. Recent analyses by (9 and 10) are broadly similar in their results. Among the most parsimonious cladograms reported in ref. 10 at least one also recovers a hominine clade that includes European fossil taxa9. also recovers Ouranopithecus as a hominine though in that analysis the dryopithecins are recovered as stem hominids.
Other taxa have been linked with Ouranopithecus or hominines. Three fossil apes from Africa, Nakalipithecus, Samburupithecus and Chororapithecus, broadly overlap in time with Ouranopithecus, Graecopithecus and Anadoluvius21,22,23 Nakalipithecus has been identified as potentially ancestral to Ouranopithecus22. However, Nakalipithecus differs in many details of dental morphology from Anadoluvius and Ouranopithecus (see Supplementary Note 3). As noted, Nakalipithecus, represented in the data matrix by 43% of the total number of characters, consistently falls outside the crown hominids, which fails to support the hypothesis of an ancestral-descendant relationship with Ouranopitheus. It has been hypothesized that both Chororapithecus and Ouranopithecus have phylogenetic affinities with gorillas8,22,23,33. However, Chororapithecus is readily distinguished from both Anadoluvius and Ouranopithecus (see differential diagnosis), and its affinity with gorillas has been questioned1,34 A close phylogenetic relationship with gorillas is not supported by our results21. claim that Samburupithecus has phylogenetic affinities with African apes and humans, though this conclusion has also been challenged by1,35, who conclude that Samburupithecus is not a hominid but instead a vestige of the early Miocene proconsuloid radiation. As with Chororapithecus and Nakalipithecus, Samburupithecus falls outside the crown hominid clade.
Diversity and paleobiogeography
A comprehensive review of the taxonomy and phylogeny of late Miocene apes is needed, given recent discoveries and reinterpretations. Here we focus on the diversity and paleobiogeographic implications of Anadoluvius (Supplementary Fig. 15; Supplementary Table 8). Anadoluvius and Ouranopithecus share attributes with other European middle and late Miocene hominids that distinguish them from late Miocene ape fossils from Africa and the broadly contemporaneous pongines Sivapithecus, Ankarapithecus, and Khoratpithecus (Supplementary Note 3). Ouranopithecus from Ravin de la Pluie and Xirochori are dated to 9.6 and 9.3 Ma respectively6,7. Ouranopithecus from Nikiti 1 is dated to 8.9 Ma6,7. Çorakyerler is dated to 8.7 Ma (Supplementary Figs. 16, 17; Supplementary Table 9 and Supplementary Note 6). The Nikiti mandible and maxilla are distinct from Ouranopithecus from the more northern Macedonian sites and may represent a different taxon13. This possibility, which needs further study, is interesting in terms of regional evolution as Nikiti 1 is likely to be slightly older than Çorakyerler6,7,29. Nikiti, Anadoluvius and Graecopithecus are distinguished from Ouranopithecus in our PCA and in having a greater degree of canine reduction, elongated P4 and large molars relative to mandibular corpus size. Anadoluvius and Graecopithecus are distinguished from Ouranopithecus in root morphology (unknown in NKT 21.) NKT 21 and Graecopithecus have inferior transverse tori positioned posterior to the mesial edge of the M1 (unknown in Anadoluvius), while the torus is anterior to the M1 in Ouranopithecus. Graecopithecus, which is considerably younger (~7.2 Ma)4, has been shown to differ from Ouranopithecus in morphology that replicates differences between late Miocene apes and early hominins, such as reduced relative canine size and premolar root morphology11 However, the Nikiti specimens have not previously been included in these comparisons.
Quantitative and qualitative comparisons reveal many differences among Balkan/Anatolian taxa, indicative of a greater diversity of late Miocene eastern Mediterranean hominids than previously recognized. Hominines appear to have been present and diverse for millions of years in the late Miocene of Europe. Based on the large number of qualitative and quantitative differences among the samples from Macedonia, Attica and Anatolia, we conclude that they represent at least three hominine genera, Ouranopithecus, Graecopithecus, and Anadoluvius. The diversity of hominines in the eastern Mediterranean mirrors that among australopithecines in the Plio-Pleistocene hominin record in Africa. In the phylogenetic analysis presented here the Balkan/Anatolian taxa are in the sister clade of crown hominines. The fact that dryopithecins are also classified as hominines in this analysis suggests that there was an in situ evolution of thickly enameled late Miocene eastern Mediterranean hominines from more thinly enameled precursors in central and western Europe, though this conclusion has been challenged9,24. Pierolapithecus, Anoiapithecus, Dryopithecus, Hispanopithecus and Rudapithecus all share attributes with extant hominines and are distinguished from pongines such as Sivapithecus and Ankarapithecus (Tables 1, 2)1,2,3,36,37, (but see refs. 9,24 for alternative views). A clade that includes both thinly and thickly enameled taxa, in this case the dryopithecins and the Balkan/Anatolian apes, has a parallel in Africa with Ardipithecus and australopithecines and with Pan and hominins.
The parallel evolution of thickly and thinly enameled members of a clade in Africa and Europe is not proof that the late Miocene European apes are all hominines, but it does make this hypothesis, supported by the results of our cladistic analysis, plausible. It is possible that the generally more thinly enameled dryopithecins and the later occurring thickly enameled Balkan/Anatolian hominines do not share an ancestor-descendant relationship and represent separate dispersal events into Europe from Africa (e.g. ref. 22), though this is less parsimonious biogeographically and contrasts with the results of the phylogenetic analysis presented here. While independent dispersal events are possible, we regard the in situ European hypothesis as more likely and more parsimonious given the current evidence. Other independent lines of evidence are also consistent with the widespread presence of hominines in Europe38.
Eastern Mediterranean apes previously assigned to Ouranopithecus span at least 2.4 million years with a geographic range roughly equal to the area between Hispanopithecus in Spain and Rudapithecus in Hungary (Supplementary Fig. 6) In the eastern Mediterranean, as in Western/Central Europe, multiple genera are present. A preliminary analysis of stable isotopes from single tooth samples of Ouranopithecus from RPl and Anadoluvius and larger samples of hipparionins suggests cooler, drier conditions at Çorakyerler and a reliance on C3 plants for both ape taxa39. Their thick enamel, robust jaws and, in the younger samples from Nikiti 1, Çorakyerler and Pyrgos Vassilissis, evidence of canine reduction, recalls the earliest African hominins. A clarification of the significance of the similarities between the Balkan/Anatolian samples and late Miocene African hominins will have to await further discoveries.
Eastern Mediterranean hominines may represent a terminal radiation arising from one or more older hominines in Europe, analogous to the radiation of Paranthropus presumably from an Australopithecus-like ancestor. Alternatively, given that European hominines most closely resemble gorillas1,2,3,8,33,36,40, it is possible that this represents a radiation of early members of the gorilla clade, mirroring the middle and late Miocene radiation of pongines in Asia37. It is also possible that European hominines represent terminal lineages of successive dispersals of hominines from Africa22, though there is no evidence of multiple lineages of hominines between 13 and 10 Ma in Africa, and this hypothesis is not supported by the results of the phylogenetic analysis presented here. Finally, some researchers have focused attention on differences among eastern Mediterranean apes, suggesting that multiple lineages are present, including the earliest known hominins11,33 In this context it is worth noting that Graecopithecus was only included in the phylogenetic analysis with all taxa, which yielded a poorly resolved cladogram. Graecopithecus is grouped with hominids but not specifically with other eastern Mediterranean hominines. However, multiple analyses have concluded that Graecopithecus and Ouranopithecus are closely related, even if this has not been demonstrated with a formal cladistic analysis (see above and Supplementary Notes 3–6).
A comprehensive phylogenetic analysis is underway to test these competing hypotheses. Whatever the outcome, the sample of ape fossils from Çorakyerler demonstrates that great ape diversity in the eastern Mediterranean is greater than previously believed and that hominines had diversified into multiple taxa long before their first documented appearance in Africa.
All fossils attributed to Anadoluvius, fossils of other taxa, and all geologic samples were recovered from the fossil locality of Çorakyerler (40°36'32“N, 33°38'01“E) in the Çankırı Basin of the central Anatolian Cenozoic basin complex, and are currently curated in the Department of Anthropology, Ankara University. Comparative samples are outlined in Supplementary Tables 1, 2. All fossils recovered at Corakyerler since 1999 are permitted by the Culture and Tourism Ministry (Dr. Ayla Sevim Erol, PI, Re: E-94949537-160.01.01-3883433, Konu : Çankırı İli, Çorakyerler Fosil Lokalitesi Kazı İzni).
Dental dimensions are standard mesiodistal and buccolingual measurements, except canine and P3 measurements, which are crown maximum (major axis) and perpendicular dimensions. Mandibular breadth measurements were taken just below the margin of the alveolar process to allow for comparisons with CO-300, which lacks the corpus base. The distance between the symphysis and the M1-M2 interproximal space is a non-standard measurement that allows for the comparison among all the specimens. It is the horizontal chord between the lingual surface of the symphysis at the alveolar edge between the central incisor alveoli and the M1-M2 interproximal space at the level of the alveolar margin. The geometric mean was calculated from the mandibular measurements and the three dental dimensions that could be measured for Graecopithecus (Supplementary Data 1). In cases in which mandibles were incomplete or crushed, mandibular arch breadth between antimeres was estimated by doubling the distance from the alveolar margin to the midline.
The diagnoses and descriptions here result from direct observation of original fossil material by ASE and DRB. All published specimens currently attributed to Ouranopithecus were examined, measured, and photographed. These observations were compared with direct observations of all published European middle and late Miocene hominids (numerous repositories, see ref. 36, see Supplementary Tables 1, 2 for explanation of the abbreviations), the type and palate of Ankarapithecus (MTA), a mandible (MTA) and a sample of isolated teeth (NHM) of Griphopithecus and Kenyapithecus, all published African Miocene catarrhines (NMK, NHM, ENM), large portions of the sample of Sivapithecus (Harvard, AMNH) and the IVPP sample of Lufengpithecus up to 1995 (Supplementary Table 2). Comparisons with Pliocene hominins are based on observations on original material of Ardipithecus, Austalopithecus and Paranthropus (NME, NMK) supplemented with high resolution casts of Australopithecus and other Pliocene hominins. Data from original fossils were supplemented with high resolution casts and/or published descriptions and images of Morotopithecus and Proconsul from Uganda, Orrorin, Sahelanthropus and Khoratpithecus. Comparisons with extant hominoids are based on data collected from the institutions listed in Supplementary Table 1. All specimens were measured by DRB using digital calipers recorded to the nearest 10th of a millimeter (Supplementary Tables 3, 4).
CT images were processed by RMGM using well established methods. The complete image stacks of each tooth were filtered using a three-dimensional median filter with a kernel size of 1 followed by a mean of least variance filter with a kernel size of 1. The filtered image stacks were imported into Avizo 6.3 (www.thermofisher.com) where the enamel, dentine, pulp cavity, and cracks were segmented semi-automatically using the 3D voxel value histogram and grayscale values. In Avizo 6.3, the teeth were reconstructed from the segmentations as triangle-based surface models using the constrained smoothing parameter.
Statistics and reproducibility
Quantitative analysis was carried out using © PAST and © Excel for Microsoft 365. The PCA is based on 12 measurements of the mandible and dentition scaled by their geometric mean (Supplementary Data 1). The PCA matrix was set at variance-covariance. Eigenvalues and % variance, scores and loadings for each PC appear in Supplementary Data 1. All data needed to replicate our phylogenetic analysis, using our assumptions and constraints or any other constraints (weighting, ordering etc.), are provided in the supplementary data. The characters and their states are listed and defined in Supplementary Data 2, Supplementary Note 5 and the data matrix in TNT format appears in Supplementary Data 3.
The matrix analyzed here is original to this research and was assembled by DRB based on direct observation of all available specimens of all taxa included in this analysis, except Orrorin and Sahelanthropus, which were scored from published descriptions. Scoring of Ardipithecus is based on observations of the original fossils supplemented with published descriptions. Since the focus of this analysis is late Miocene eastern Mediterranean hominids, we used Mesquite (Mesquite version 3.70 (build 940) Copyright (c) 1997-2021 W. Maddison and D. Maddison) to define multiple outgroup taxa (early Miocene Ekembo and middle Miocene Equatorius and Nacholapithecus). We performed multiple analyses, differing in included taxa and assumptions of character ordering. Characters were unweighted. We used a progression of OTUs based on representation in the data matrix and reliability of character scoring. From a total potential number of OTUs of 23, we progressed from 18 OUTs, excluding Sahelanthropus and Orrorin, which could only be coded from published descriptions, and Samburupithecus, Chororapithecus and Graecopithecus, with more than 80% missing data. The 19 OTUs include Sahelanthropus (72%), as noted, coded from published descriptions. Orrorin (29%) was added next (as with Sahelanthropus, coded from published descriptions), followed by all three poorly represented taxa. Each OTU set was analyzed using fully unordered, partly ordered, and fully ordered character states (see below for further details). The four topologies including 18, 19, 20 and 23 OTUs are reproduced in Fig. 4. As noted, the topologies are identical in both the partly ordered and unordered analyses. Results of the analyses using fully ordered character matrices on each OTU set appear in the supplementary data (Supplementary Fig. 14).
The partly ordered character matrices consist of roughly half the multistate characters (21 of 41) ordered. Wagner parsimony allows for reversals, so two state characters (71 of 112) were not ordered. Of the 20 multistate characters that were not ordered, all consisted of characters in which the outgroup (Ekembo, Equatorius, and Nacholapithecus) had the intermediate condition. These intermediate character states are polarized by definition as primitive. To order these characters would mean forcing the algorithm into a transformation series from intermediate to one extreme and then the other, which is both counter-intuitive from an evolutionary perspective and less parsimonious. For example, ordering character 57, I2 position relative to the nasal margin, requires a transformation series from the intermediate condition (in line with the nasal margin) to one extreme (e.g. mesial) and then the other (e.g. lateral). Allowing the algorithm to freely follow a transformation sequence from intermediate to one extreme or the other without having to pass through the opposite extreme seems more reasonable. Supplementary Note 5 lists all the characters, their states, definitions, and whether they are ordered in the partly ordered analyses.
Our decision to present the results of the analysis of unordered character matrices, which are always more parsimonious for these data, is based on our concern that ordering transformation series within a character limits the number of alternative character state transformations and presupposes a specified history of evolution for a particular character. It could be argued that because a transformation series results from genetic modification in ancestral-descendant populations, the ends of a transformation series must pass through intermediates, so that an ordering of character state transformations emerges inevitably from the evolutionary process. While it may seem intuitive that a character such as maxillary length should be ordered (going from short to intermediate to long), the fossil evidence indicates that this is not the case within this sample of taxa. Character state orders that seem “counter-intuitive” can be explained by the fragmentary and random nature of the fossil record. Over the course of hundreds of thousands or millions of years there is sufficient time for reversals or apparent “jumps” to occur without the preservation of intermediate steps in the fossil record. We know very little about the genetics of character state transformations. Intermediate states between thin and thick enamel are known because they are documented in different taxa, but this does not prove that all transformations for thick to thin in every lineage must have passed through the same intermediates. A short period of extended duration of amelogenesis from a thinly enameled ancestor may result in a final thickness that would be measured as thick. We simply do not know enough about the genetics of character formation to say with certainty that all character transformation series must pass through intermediates from one extreme to the other.
Other “counter-intuitive” character state transformation series include the development of the ectotympanic tube (absent, partial or complete), and lumbar vertebrae number (seven to six to five to four to three), none of which are supported by the majority of most parsimonious analyses of hominoids in numerous publications. Must these transformations have had intermediates that are simply missing from the fossil record or is it possible to go from, for example, seven to four to five lumbar vertebrae by simple conversion of vertebral type (e.g. thoracic to lumbar)? Humans have a median number of five lumbar vertebrae but four is not uncommon. Great apes have a median number of three but four is common. Given this variability a “jump” from three to five or vice versa is certainly feasible. We do not understand the genetics of these character states sufficiently to know how transformation occurs and if “jumps”, which are more a function of how we define character states than anything else, are likely, probable or impossible. We need to remember that all character states are defined by the researcher and have no fundamental genetic basis. They are simply what we observe and deem to be informative. Most character states are amalgams of genetically determined attributes and processes controlled by one or more genes and their interactions. Finally, it could be argued that allowing a character state to “jump” to a subsequent state without an intermediate condition based purely on parsimony is akin to rejecting Darwinian gradualism in favor of Goldschmidtian “hopeful monsters”. However, Goldschmidt was referring to species origins and not individual character states. Hypothesizing character state transformations that do not pass through intermediate states does not violate the basic principles of Darwinian evolution.
We choose not to weigh characters to avoid biasing the analysis by unduly emphasizing or de-emphasizing one character over another, since we do not see how weighing can be accomplished confidently in this character matrix.
All data needed to replicate this analysis, using our assumptions and constraints or any other constraints (weighting, ordering etc.), are provided in the supplementary data.
Consensus cladograms were recovered using TNT with the traditional search option and Wagner trees enabled [Willi Hennig Society; © Goloboff & Catalano (2006). Cladistics. DOI 10.1111/cla. 12160]. TNT was used to map synapomorphies and calculate Bremer support using the DOBREM script and calculate a strict consensus tree (Fig. 4 and supplementary data). The characters and their states are listed and defined in tables S2, 3 and the data matrix in TNT format appears in Supplementary Data 3.
The holotype and all the paratypes were molded and cast by DRB using high resolution RTV silicone and polyurethane (Esprit Composite ™.) Molds were made of each of the separated portions of CO-2800 (premaxillary fragment, right maxilla, interorbital fragment, left orbital pillar and frontal.) CO-2100 (RI1) was found separately and is associated with CO-2800. Molds and casts were also made of this specimen. These casts were used to facilitate the reconstruction and will be made available to interested colleagues.
CO-205 (Supplementary Figs. 1, 5). The palate of Anadoluvius was recovered in two main fragments, two isolated teeth and some smaller fragments. The restoration of this specimen was relatively straight forward due to the preservation of multiple points along the midline. The right side preserves much of the palatine process of the maxilla with two midpoints (P4 and M2- M3), with the intermaxillary suture visible. A piece of the left alveolar process with parts of the alveoli of the I1 and I2 is also preserved, with the midline intact. Simple mirror-imaging allows for the unambiguous positioning of the alveolar processes, premaxillary fragment and incisors. The nasoalveolar clivus is not preserved beyond the portion of the palatal surface and the partial incisor alveoli. However, with the palatine process preserved to the midline it is possible to restore the entire premaxillary palatal surface with mirror imaging. Supplementary Fig. 1 illustrates issues with the reconstruction in ref. 28 corrected in our analysis.
CO-2800 (Fig. 1 and Supplementary Figs. 2, 3). The female partial cranium (CO-2800) was recovered intact in a block of relatively soft mudstone matrix (Supplementary Fig. 3) There was some distortion and slight displacement between portions separated by cracks. The matrix was carefully removed and replaced with plasticine modeling clay to ensure that the original positions of the displaced portions (incisor and premaxillary fragment, frontal nasal processes, left malar infraorbital surface and left orbital pillar) were maintained. Slight adjustments were made to bring conjoining surfaces into alignment though some plastic deformation remains.
The superior margin of the right orbit and the frontal bone in the region of the right temporal line are distorted. The frontal bone superior to the right orbit is pushed slightly superiorly and posteriorly and the right orbital pillar is tilted anteriorly. On the left side the specimen was fractured, which probably limited plastic distortion. A few millimeters separate the preserved portion of the nasal process of the maxilla from the maxillary process of the frontal bone on each side. They were positioned following the contours of the preserved surfaces, leaving little room for error. However, it is possible that the maxilla was slightly more ventrally rotated than in our final reconstruction. About 10 mm separate the premaxillary fragment from the palatine process of the maxilla. However, as it preserves portions of the alveoli for both upper central incisors and for the right I2 this fragment could be accurately positioned in the midline, in alignment with other preserved midline structures (nasion and the intermaxillary suture). The nearly complete alveolus for the RI1 is a perfect match for CO-2100. Casts of the separated portions of CO-2800 were used to produce a reconstruction with the tooth row, right nasal margin and palatine process, which are displaced but cannot be repaired on the original, repositioned and realigned (Supplementary Fig. 2) Some residual plastic distortion on the right side remains. For the final restoration of the original fossil the clay was replaced with casting wax, which is more resilient.
CO-305 (Supplementary Fig. 4). This mandible is damaged and cannot be restored reliably either on the original or with casts, given the extent of plastic deformation. However, it was possible to remove some matrix, exposing more of the canine, which is pushed into its alveolus. We were able to segment (Avizo) and virtually extract the canine from µct scan data (Supplementary Fig. 11a). Cleaning revealed that the alveolar portion of the symphysis is in its natural position relative to the right alveolar process of the corpus, allowing for comparisons with Balkan specimens. CO-300, an M2 (Supplementary Fig. 4) was not included in the original hypodigm of Ouranopithecus turkae. It is a perfect match for CO-305 (wear, size and interproximal facet) and is described here together with the mandible.
Further information on research design is available in the Nature Portfolio Reporting Summary linked to this article.
All data generated or analyzed during this study are included in this publication (and Supplementary Materials). All specimens from Çorakyerler are deposited in the Department of Anthropology, Ankara University. Accession numbers are provided in the column headings to Supplementary Tables 3, 4. Comparative samples are listed in Supplementary Tables 1, 2. The computed tomography scans are available from ASE or DRB on reasonable request. The new taxon has the following Life Science Identifier: urn:lsid:zoobank.org:act:FE6E46C7-BA39-428C-88E7-DC5FB2F5BE43.
26 September 2023
A Correction to this paper has been published: https://doi.org/10.1038/s42003-023-05358-0
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We are grateful to the reviewers and editors for their insightful comments that significantly improved this manuscript. DRB acknowledges with much gratitude the researchers, curators and collections managers who have provided access to fossils and comparative collections in their care. The authors thank Prof. Dr. Volkan Karabacak (Eskisehir Osman Gazi University) for the DEM images in Supplementary Fig. 14. The Çorakyerler excavations are supported by the Turkish Ministry of Culture and Tourism, the General Directorate of Cultural Heritage and Museums, Ankara University, and the Turkish Historical Society; we are thankful to all of them. DRB acknowledges support from NSERC (grant number RGPIN-2016-06761).
The authors declare no competing interests.
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Sevim-Erol, A., Begun, D.R., Yavuz, A. et al. A new ape from Türkiye and the radiation of late Miocene hominines. Commun Biol 6, 842 (2023). https://doi.org/10.1038/s42003-023-05210-5