Predation is a major driving force for the evolution of functional forms. Avoidance of visual predators has resulted in different kinds of anti-predator defences, such as: camouflage, crypsis, disruptive coloration, and masquerade or mimesis. Camouflage is one of the forms involving shape, colouration, structure and behaviour when the visual pattern and orientation of an animal can determine whether it lives or dies. Inferring the behaviour and function of an ancient organism from its fossilised remains is a difficult task, but in many cases it closely resembles that of its descendants on uniformitarian grounds. Here we report and discuss examples of morphological and behavioural traits involving camouflage named recently as a flatoidinisation syndrome, shown by the inclusion of a planthopper in mid-Cretaceous Burmese amber. We found a new genus and species of an extinct Cretaceous planthopper family Mimarachnidae showing peculiar complex morphological adaptations to camouflage it on tree bark. Due to convergence, it resembles an unrelated tropiduchid planthopper from Eocene Baltic amber and also a modern representatives of the planthopper family Flatidae. Flattening of the body, the horizontal position of the tegmina at repose, tegmina with an undulating margin and elevated, wavy longitudinal veins, together with colouration and more sedentary behavioral traits enable these different insects to avoid predators. Our discovery reveals flatoidinisation syndrome in mid-Cretaceous Burmese amber which may provide insights into the processes of natural selection and evolution in this ancient forest.
The old adage “form follows function” is a guiding principle of functional morphology, a discipline, which is an interpretation of the function of an organism or organ system by reference to its shape, form and structure. Inferring the behaviour and function of an ancient organism from its fossilised remains is hard, but not impossible3, with general procedures for interpreting how organisms lived from their fossilized remains having been outlined4. The documentation of the wealth of information demonstrating behaviours of extant organisms extending far back in time and showing that the behaviour of extinct organisms closely resembles that of their descendants were recently summarized5,6.
Predation is a major driving force for the evolution of functional forms7. To avoid being detected by visual predators, different kinds of anti-predation defences have evolved, such as camouflage, crypsis, disruptive coloration, masquerade, or mimesis8,9. These anti-predator defences are adaptive to the organism’s surroundings, or in an aposematic organism, an inedible object that can affect the predation of visual-hunting predators10,11,12. Camouflage is one of the anti-predator defence functions involving shape, colouration, structure and behaviour13. Animals use camouflage to avoid detection or recognition by predators or prey8,14,15. Potential prey will benefit from being less visible or hidden nicely against their background, and gain more selective advantages to produce offspring (which will also inherit this trait)14. Among the group of predators competing for the same resources (prey), the predator that is not spotted easily has an advantage and makes more kills16. Prey and predators play the evolutionary game of hide-and-seek to survive, leading to the evolution of exquisite camouflage through natural selection.
Mimarachnidae is one of the extinct families of planthoppers (Fulgoroidea: Fulgoromorpha: Hemiptera), known exclusively from the Cretaceous. According to the former fossil records from the Berriasian-Barremian (ca. 145–125 Ma) deposits in Baissa (Buriatiya, Russia), early Cretaceous (ca. 140–120 Ma) Kaseki-kabe locality in Kuwajima (Japan), early Barremian deposit from Sierra del Montsec (north-eastern Spain), mid-Cretaceous Burmese amber and some undescribed specimens known from localities like Turga (central Siberia) of early Cretaceous, Khurilt (Mongolia) of Barremian or Aptian, Khetana (East Siberia) of Middle Albian, Kzyl-Zhar Hill (Kazakhstan) of Turonian17,18,19,20,21,22 the family was widespread from the equatorial to high latitude regions in the northern hemisphere in the Cretaceous period. First described from Lower Cretaceous compression fossils of Baissa18, the family is characterized by its simplified venation and setigerous metatibial pecten and hind leg amature18,19,20. Recently, several amber inclusions had been reported from Burmese amber17,21,22 which greatly increased the morphological disparity of the family, including species with different and peculiar morphological characters like giant size, elongated head, and a rostrum that exceeds the length of the body17,21,22.
Herein, we report and discuss examples of another morphological and behavioural trait of camouflage, named recently as flatoidinisation syndrome23. This syndrome is now recognised from the family Mimarachnidae, preserved in mid-Cretaceous Burmese amber from northern Myanmar (Kachin State)24,25,26 (Fig. 1).
Class Insecta Linnaeus, 1758.
Order Hemiptera Linnaeus, 1758.
Suborder Fulgoromorpha Evans, 1946.
Superfamily Fulgoroidea Latreille, 1807.
Family Mimarachnidae Shcherbakov, 2007.
Genus Mimaplax gen. nov
LSID: urn:lsid:zoobank.org:act: 5DF955E9-883C-4E2D-9CD1-58BADB8B8311.
Mimaplax ekrypsan sp. nov. by present designation and monotypy.
Generic name is derived from Ancient Greek words mimos for actor, mime, and pláx meaning anything flat and broad; making reference to body shape. Gender: neuter.
Differs from other genera of Mimarachnidae in general appearance, being distinctly flattened; with membranous and translucent tegmen and widely rounded anterobasal angle, sinuate costal margin, and broad costal cell (wider than in Chalicoridulum; costal cell narrow in other congeners); head with vertex concave with lateral margins expanded above compound eyes (no such expansion in other genera with this character known); trigons not adjoining medially (trigons adjoining medially in Burmissus); pronotum and mesonotum with strongly elevated, cristate median carinae (median carinae not cristate in other genera); claval veins adjoining commissural margin (as in Mimarachne).
Mimaplax ekrypsan sp. nov
Specific epithet is derived from Ancient Greek ékrypsan, meaning hidden one, and refers to cryptic characters of species.
Burmese amber, elongate oval piece, 29 × 15 × 7 mm, weight 1.85 g. Specimen No. NIGP170539, deposited in Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing. Holotype incomplete inclusion – head and abdomen partly preserved, including: pronotum, mesonotum, left tegmen, right tegmen, hind wings, fore legs, mid legs and hind legs. Syninclusions: nymph of Hemiptera: Fulgoroidea: Neazoniidae, 0.8 mm long.
Locality and horizon
Rostrum reaching metacoxae. Tegmen with branch ScP + RA not reaching margin nor RP, stem MP with two terminal branches. Pro- and mesolegs with basi- and midtarsomeres’ plantar surfaces covered with brush of setae; metatibio-metatarsal formula (apical teeth) 4: 5: 5. Male anal tube widened apically, longer ventrally than dorsally; anal cercus subquadrate, anal style roundly lingulate with long apical setae. Gonostyle long and narrow, but distinctly shorter than aedeagus, S-shaped, widened apically. Aedeagus long, tube-like, forked apically, periandrium not visible.
Description. (see appendix).
Camouflage is one of the most common anti-predator strategies in nature9,10,29,30,31,32. It is the art of concealment and it can be achieved in many different ways: matching the background like self-decoration or debris-carrying, disruptive colouration for masking edge information, masquerading as a non-target object like leaf mimesis, or actively changing colour and pattern10,13,14,32,33,34,35,36,37. Exceptionally preserved fossils can show examples of camouflage. The oldest record of cryptic coloration comes from the Carboniferous38. Various forms of these phenomena can be found among Jurassic insects from the Daohugou biota among the Palaeontinidae (Hemiptera)39,40,41,42, Orthoptera43,44, Mecoptera45 and Neuroptera46. Cretaceous ambers reveal several spectacular examples of camouflage in small predatory insects47,48 including chrysopoid larvae (green lacewings), myrmeleontoid larvae (split-footed lacewings and owlflies), and reduviids (assassin bugs). Another example of camouflage comes from archostematan beetles49,50.
Terms and definitions relevant to visual camouflage are listed14 where camouflage is treated in a wider sense, meaning all strategies involved in concealment for prevention of detection and recognition. Crypsis is a narrower term covering mechanisms initially preventing detection. It involves at least shape, colour, and colour pattern. However, a cryptic individual must also solve the major problem of body contour. For homogeneous backgrounds the cryptic coloration can efficiently increase the difficulty of detection and recognition by visual hunting predators, but the predation risk will increase in heterogeneous habitats where a background matching solution performs poorly. One solution is to combine colouration and shape in disruptive patterns, most widely used as disruptive coloration, a visual breaking up of the body outline so that parts of it appear to fade separately into the background36. Another way of minimizing contour cues involves actually or apparently reducing any tell-tale shadows, accomplished through a dorsoventral flattening, often in combination with lateral flaps or various irregular body protuberances that bridge the gap between body and substrate, referring to countershading in some animals31,51,52,53,54,55.
In our case, flatoidinisation syndrome was proposed to represent a specialised, complex camouflage, uniting shape, colour and behaviour23. The name of the syndrome is derived from morphological similarity to some representatives of the planthopper family Flatidae (Hemiptera: Fulgoroidea) and subfamily Flatoidinae. These groups contain taxa that are in most cases distinctly dorsoventrally flattened, sometimes very strongly flattened, with shapes and colouration enabling them to be almost invisible on tree bark, or on lichens and other plants covering the bark of trees in the tropical and subtropical zones56,57,58,59,60,61,62. Flatoidinae is one of subfamilies of flatid planthoppers, currently the subfamily comprises 25 genera and 225 species59. The flatoidinisation syndrome is presented among them to various extent, with the most spectacular forms among taxa inhabiting Madagascar61,62,63. Some elements of flatoidinisation syndrome (flattening of body with wings held tectiform or horizontally with camouflage or disruptive coloration) can be observed in unrelated planthoppers of the families Eurybrachidae, Lophopidae, Ricaniidae and Fulgoridae23,56. However, the most complete and complex flatoidinisation syndrome in morphology and behaviour is presented by Flatoidinae flatids. Among fossils the syndrome was described first in a representative of the fossil genus Gedanotropis Szwedo et Stroiński, 2017, from Eocene Baltic amber, belonging to the planthopper family Tropiduchidae23. Similar to representatives of flatoidine Flatidae60,61,62, the shape of the tegmina of Gedanotropis is subquadrate, the anterior portion of the costal margin being strongly curved and shifted anteriad, the costal margin is undulate, the tegmina are held flat, and longitudinal veins are polychotomous (Fig. 7). This shape suggests that the insect was hiding on tree trunks, sitting flat on the bark, reducing shadows with lateral undulations of the tegminal costal margin. The colour pattern of Gedanotropis remains unknown, but very probably it presented some camouflage colouration.
The flatoidinisation syndrome is developed also in the newly described mid-Cretaceous genus Mimaplax. Contrary to previously described Mimarachnidae17,18,19,20,21,22, it is flattened dorsoventrally, with widened tegmina held flat and with undulate margins. The main veins are not polychotomous (multiforked), but irregularly wavy, and elevated, probably resembling the texture of the background. Also the elevated, cristate median carinae of the pronotum and mesonotum are devices of concealment on tree bark. The head capsule, flattened, with concave disc, and lateral margins elevated above the eyes, resembles the situation in modern representatives of Flatoidinae flatids. In addition, traces of cryptic coloration are preserved in remnants of irregular darker patches, bands and spots in Mimaplax (Figs 2 and 6).
What are the reasons for such sophisticated defence mechanisms? The answer is simple – pressure from predators. The behaviour of Flatoidinae from Madagascar, where the most numerous and bizarre forms are to be found (12 genera with 39 species58,59,63) is virtually unknown, but among potential predators of these relatively huge hoppers several groups of vertebrates should be taken into consideration: lizards, chameleons, birds and small mammals64.
The same pressure from predators could have resulted in flatoidinisation syndrome in Mimaplax within the forests of the mid-Cretaceous equatorial area of the West Burma terrane and adjacent islands. A warm, humid, nearshore marine setting with high species diversity has been proposed for the amber locality17,24,25,26,65,66. Potential predators with good visual ability to distinguished cryptic prey have been reported from the amber locality, like small non-avian theropod dinosaurs67, enanthiornithid birds68,69,70 and various lizards71. These creatures could penetrate tree trunks, branches, twigs and tree canopies in search of prey (Fig. 6). Small theropods and enanthiornithids (like today’s birds) likely had tetrachromatic vision enhanced by a suite of oil-droplet filters72,73,74 which made them very efficient in locating and recognising potential insect prey75. In this context, background pattern matching may be insufficient to conceal objects because of edge information. A ruffled outline of the body better conceals the insect than a straight boundary outline36. Colouration with patches touching the outline and differentially blending into the background, disrupt the continuity of extended edges, or translucence mixed with solid patches, may break up the continuity of the outline36,76,77,78,79. Vertebrate visual systems perform more effectively when detecting straight boundaries compared to curvilinear boundaries80, and such combination of shape and coloration, were likely supplemented by behaviour55,79. The probability of an individual being attacked by a predator is dependent on the level of matching an animal has to its background, as seen through the eyes of the key predators.
Ultimately, Mimaplax ekrypsan gen. et sp. nov., offers an unprecedented opportunity to observe morphological adaptations including sophisticated camouflage leading to flatoidinisation syndrome, providing exceptional and unexpected insights into the evolution of the Cretaceous Mimarachnidae.
The specimen was prepared in the Laboratory of Evolutionary Entomology and Museum of Amber Inclusions, University of Gdańsk, Poland, and was observed under a stereoscopic microscope with varying illumination and filters to increase contrast of pigmentation and morphological details. Photographs were taken using a Zeiss Stereo Discovery V.16 microscope system with Zen software, in the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. All images are digitally stacked photomicrographic composites of more than 50 individual focal planes obtained using the free software Combine ZP for a better illustration of 3D structures. The line drawings were prepared with Nikon microscope (SMZ1000) with a drawing tube attached, photographs and drawings were adjusted using CorelDraw X8 and CorelPhoto-Paint X8 packages. The specimen NIGP170539 is housed at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (NIGPAS). The nomenclature of the wing venation used in this paper is based on the general scheme for the Hemiptera81,82.
Lyell, C. Principles of Geology 2 i–xii+1–332 (John Murray, 1832).
Van Valen, L. Letter to the Editors. The Red Queen. Am. Nat. 111(980), 809–810, https://doi.org/10.1086/283213 (1977).
Benton, M. J. Studying function and behavior in the fossil record. PLoS Biology 8 (3), e1000321, 1–5, https://doi.org/10.1371/journal.pbio.1000321 (2010).
Briggs, D. E. G. & Crowther, P. A. Palaeobiology II i–xv+1–583 (Blackwell Publishing Company, 2001).
Boucot, A. J. Evolutionary Paleobiology of Behavior and Coevolution i–x+1–585 (Elsevier, 1990).
Boucot, A. J. & Poinar, G. O. Jr. Fossil Behavior Compendium i–xxviii+1–363 (CRC Press, 2010).
Svanbäck, R. & Eklöv, P. Catch me if you can—predation affects divergence in a polyphonic species. Evolution 65(12), 3515–3526, https://doi.org/10.1111/j.1558-5646.2011.01398.x (2011).
Skelhorn, J. & Rowe, C. Cognition and the evolution of camouflage. Proc. R. Soc. B 283, 20152890, https://doi.org/10.1098/rspb.2015.2890 (2016).
Quicke, D. L. J. Mimicry, crypsis, masquerade and other adaptive resemblances i–xvii+1–557 (Wiley-Blackwell, 2017).
Ruxton, G. D., Sherratt, T. N. & Speed, M. P. 1.8. Masquerade in Avoiding attack: the evolutionary ecology of crypsis, warning signals and mimicry (eds Ruxton, G. D., Sherratt, T. N. & Speed, M. P.) 23–25 (Oxford University Press, 2004).
Skelhorn, J., Rowland, H. M., Speed, M. P. & Ruxton, G. D. Masquerade: camouflage without crypsis. Science 327(5961), 51–51, https://doi.org/10.1126/science.1181931 (2010).
Barnett, J. B., Cuthill, I. C. & Scott-Samuel, N. E. Distance-dependent pattern blending can camouflage salient aposematic signals. Proc. R. Soc. B 284, 20170128, https://doi.org/10.1098/rspb.2017.0128 (2017).
Pasteur, G. A classificatory review of mimicry systems. Ann. Rev. Ecol. Syst. 13(1), 169–199, https://doi.org/10.1146/annurev.es.13.110182.001125 (1982).
Stevens, M. & Merilaita, S. Animal camouflage: current issues and new perspectives. Phil. Trans. R. Soc. B 364, 423–427, https://doi.org/10.1098/rstb.2008.0217 (2009).
Robledo-Ospina, L. E., Escobar-Sarria, F., Troscianko, J. & Rao, D. Two ways to hide: predator and prey perspectives of disruptive coloration and background matching in jumping spiders. Biol. J. Linn. Soc. 122(4), 752–764, https://doi.org/10.1093/biolinnean/blx108 (2017).
Eisner, T., Hicks, K., Eisner, M. & Robson, D. S. “Wolf-in-sheep’s-clothing” strategy of a predaceous insect larva. Science 199(4330), 790–794, https://doi.org/10.1126/science.199.4330.790 (1978).
Jiang, T., Szwedo, J. & Wang, B. A giant fossil Mimarachnidae planthopper from the mid-Cretaceous Burmese amber (Hemiptera, Fulgoromorpha). Cret. Res. 89, 168–173, https://doi.org/10.1016/j.cretres.2018.04.012 (2018).
Shcherbakov, D. E. Mesozoic spider mimics—Cretaceous Mimarachnidae fam. n. (Homoptera: Fulgoroidea). Russ. Entomol. J. 16(3), 259–264 (2007).
Szwedo, J. Distributional and palaeoecological pattern of Lower Cretaceous Mimarachnidae (Hemiptera: Fulgoromorpha). Entomol. Gen. 31(3), 231–242, https://doi.org/10.1127/entom.gen/31/2008/231 (2008).
Szwedo, J. & Ansorge, J. The first Mimarachnidae (Hemiptera: Fulgoromorpha) from Lower Cretaceous lithographic limestones of the Sierra del Montsec in Spain. Cret. Res. 52B, 390–401, https://doi.org/10.1016/j.cretres.2014.03.001 (2015).
Shcherbakov, D. E. First record of Cretaceous family Mimarachnidae (Homoptera: Fulgoroidea) in amber. Russ. Entomol. J. 26(4), 389–392 (2017).
Zhang, X., Ren, D. & Yao, Y. A new genus and species of Mimarachnidae (Hemiptera: Fulgoromorpha: Fulgoroidea) from mid-Cretaceous Burmese amber. Cret. Res. 90, 168–173, https://doi.org/10.1016/j.cretres.2018.04.012 (2018).
Szwedo, J. & Stroiński, A. Who’s that girl? The singular Tropiduchidae planthopper from the Eocene Baltic amber (Hemiptera: Fulgoromorpha). Palaeontol. Electronica 20.3.60A, 1–20, https://doi.org/10.26879/784 (2017).
Cruickshank, R. D. & Ko, K. Geology of an amber locality in the Hukawng Valley, Northern Myanmar. J. Asian Earth Sci. 21, 441–455, https://doi.org/10.1016/S1367-9120(02)00044-5 (2003).
Kania, I., Wang, B. & Szwedo, J. Dicranoptycha Osten Sacken, 1860 (Diptera, Limoniidae) from the earliest Cenomanian Burmese amber. Cret. Res. 52B, 522–530, https://doi.org/10.1016/j.cretres.2014.03.002 (2015).
Thu, K. & Zaw, K. Gem deposits of Myanmar in Myanmar Geology, Resources and Tectonics (eds Barber, A. J., Zaw, K. & Crow, M. J.) Mem. Geol. Soc. London, 48, 497–529, https://doi.org/10.1144/M48.23 (2017).
Shi, G. H. et al. Age constraint on Burmese amber based on U–Pb dating of zircons. Cret. Res. 37, 155–163, https://doi.org/10.1016/j.cretres.2012.03.014 (2012).
Smith, R. D. A. & Ross, A. J. Amberground pholadid bivalve borings and inclusions in Burmese amber: implications for proximity of resin-producing forests to brackish waters, and the age of the amber. Earth Env. Sci. T. R. So. 107, 239–247, https://doi.org/10.1017/S1755691017000287 (2018).
Bates, H. W. Contributions to an insect fauna of the Amazon Valley. Lepidoptera: Heliconid. Trans. Linn. Soc. Lond. 23, 495–566 (1862).
Wallace, A. R. Mimicry and other protective resemblances among animals. Westminster Review 88, 1–43 (1867).
Cott, H. B. Adaptive coloration in animals i–xxxii+1–508+48 pls (Methuen & Co LTD, 1940).
Wickler, W. Mimicry in plants and animals 1–253 (McGraw-Hill, 1968).
Stevens, M. & Merilaita, S. Defining disruptive coloration and distinguishing its functions. Phil. Trans. R. Soc. B 364, 481–488, https://doi.org/10.1098/rstb.2008.0216 (2009).
Wedmann, S., Bradler, S. & Rust, J. The first fossil leaf insect: 47 million years of specialized cryptic morphology and behavior. Proc. Natl. Acad. Sci. USA 104(2), 565–569, https://doi.org/10.1073/pnas.0606937104 (2007).
Pérez-de la Fuente, R. et al. Early evolution and ecology of camouflage in insects. Proc. Natl. Acad. Sci. USA 109(52), 21414–21419, https://doi.org/10.1073/pnas.1213775110 (2012).
Webster, R. J., Godin, J. G. J. & Sherratt, T. N. The role of body shape and edge characteristics on the concealment afforded by potentially disruptive marking. Anim. Behav. 104, 197–202, https://doi.org/10.1016/j.anbehav.2015.03.027 (2015).
Mugleston, J. et al. Reinventing the leaf: multiple origins of leaf-like wings in katydids (Orthoptera: Tettigoniidae). Invertebrate Systematics 30(4), 335–352, https://doi.org/10.1071/IS15055 (2016).
Schneider, J. W. & Werneburg, R. Insect biostratigraphy of the Euramerican continental Late Pennsylvanian and Early Permian in Non-marine Permian biostratigraphy and biochronology (eds Lucas, S. G., Cassinis, G. & Schneider, J. W.) Geol. Soc. London Spec. Pub. 265, 325–336, https://doi.org/10.1144/GSL.SP.2006.265.01.15 (2006).
Wang, B., Zhang, H., Fang, Y. & Zhang, Z. A new genus and species of Palaeontinidae (Insecta: Hemiptera) from the Middle Jurassic of Daohugou, China. Ann. Zool. 56(4), 757–762, https://doi.org/10.3161/000345406779508606 (2006).
Wang, B., Zhang, H. C., Fang, Y. & Zhang, Y. A revision of Palaeontinidae (Insecta: Hemiptera: Cicadomorpha) from the Jurassic of China with descriptions of new taxa and new combinations. Geol. J. 43, 1–18, https://doi.org/10.1002/gj.1092 (2008).
Wang, Y., Shih, C., Szwedo, J. & Ren, D. New fossil palaeontinids (Hemiptera, Cicadomorpha, Palaeontinidae) from the Middle Jurassic of Daohugou, China. Alcheringa 37(1), 19–30, https://doi.org/10.1080/03115518.2012.690972 (2013).
Chen, J., Zhang, H. C., Wang, B., Zheng, X. T. & Wang, X. L. New Jurassic Sinopalaeocossus and related genera with notes on their evolutionary implications (Hemiptera, Palaeontinidae). Ins. Syst. Evol. 47, 113–129, https://doi.org/10.1163/1876312X-47022136 (2016).
Fang, Y., Zhang, H. C. & Wang, B. A new species of Aboilus (Insecta, Orthoptera, Prophalangopsidae) from the Middle Jurassic of Daohugou, Inner Mongolia, China. Zootaxa 2249, 63–68 (2009).
Gu, J. J., Qiao, G. X. & Ren, D. Revision and new taxa of fossil Prophalangopsidae (Orthoptera: Ensifera). J. Orthoptera Res. 19, 41–56, https://doi.org/10.1665/034.019.0110 (2010).
Wang, Y. et al. Jurassic mimicry between a hangingfly and a ginkgo from China. Proc. Natl. Acad. Sci. USA 109(50), 20514–20519, https://doi.org/10.1073/pnas.1205517109 (2012).
Wang, Y. J. et al. Ancient pinnate leaf mimesis among lacewings. Proc. Natl. Acad. Sci. USA 107(37), 16212–16215, https://doi.org/10.1073/pnas.1006460107 (2010).
Wang, B. et al. Debris-carrying camouflage among diverse lineages of Cretaceous insects. Sci. Adv. 2, e1501918, https://doi.org/10.1126/sciadv.1501918 (2016).
Liu, X. Y. et al. Liverwort mimesis in a Cretaceous lacewing larva. Curr. Biol. 28(9), 1475––1481.e1, https://doi.org/10.1016/j.cub.2018.03.060 (2018).
Jarzembowski, E. A., Wang, B., Zhang, H. & Fang, Y. Boring beetles are not necessarily dull: new notocupedins (Insecta: Coleoptera) from the Mesozoic of Eurasia and East Gondwana. Cret. Res. 52B, 431–439, https://doi.org/10.1016/j.cretres.2014.03.006 (2015).
Jarzembowski, E. A., Wang, B. & Zheng, D. A new serrated archaic beetle (Coleoptera: Archostemata) from mid-Cretaceous Burmese amber. Cret. Res. 92, 26–30, https://doi.org/10.1016/j.cretres.2018.07.013 (2018).
Matthews, R. J. & Matthews, J. R. Insect behavior. 2nd edition i–xiii+1–514 (Springer Science+Business Media B.V., 2010).
Chapman, R. F., Simpson, S. J. & Douglas, A. E. The insects. Structure and function. 5th edition 1–xxxi+1–929 (Cambridge University Press, 2012).
Gullan, P. J. & Cranston, P. S. The insects – an outline of entomology. 5th edition i–xxv+1–598 (John Wiley & Sons Ltd., 2014).
Ruxton, G. D., Speed, M. P. & Kelly, D. J. What, if anything, is the adaptive function of countershading? Animal Behav. 68, 445–451, https://doi.org/10.1016/j.anbehav.2003.12.009 (2004).
Stevens, M. & Ruxton, R. D. The key role of behaviour in animal camouflage. Biol. Rev. 94, 116–134, https://doi.org/10.1111/brv.12438 (2019).
O’Brien, L. B. The wild wonderful world of Fulgoromorpha in Zikaden-leafhoppers, planthoppers and cicadas (Insecta: Hemiptera: Auchenorrhyncha) (ed. Holzinger, W.) Denisia 4, 83–102 (2002).
Medler, J. T. A review of the Sri Lankan Flatidae (Homoptera: Fulgoroidea). Oriental Insects 40, 231–265, https://doi.org/10.1080/00305316.2006.10417477 (2006).
Świerczewski, D. & Stroiński, A. Madagascar Flatidae (Hemiptera, Fulgoromorpha): state-of-the-art and research challenges. ZooKeys 319, 293–301, https://doi.org/10.3897/zookeys.319.4148 (2013).
Bourgoin, T. Flatoidinae. FLOW (Fulgoromorpha Lists on The Web): a world knowledge base dedicated to Fulgoromorpha. Version 8, updated 29 March 2019, http://hemiptera-databases.org/flow/ (2019).
Bertner, P. 2014. Camouflaged flatid hopper (Flatidae). Mt. Isarog National Park, Philippines, https://rainforests.smugmug.com/Strategies/Camouflage/i-BZdKc9m/A ©Paul Bertner (2014).
Bertner, P. Unidentified Flatidae, Flatoidiniae planthopper, Ranomafana National Park, Madagascar, https://rainforests.smugmug.com/Members-only/Countries-Pro/Madagascar/i-hQMwkp7 ©Paul Bertner (2015).
Damgaard, A.L. Unidentified flatoidinae Flatidae inclusion in Quaternary Madagascar copal, https://www.flickr.com/photos/amber-inclusions/6724866205/in/photostream/lightbox/ ©Anders Leth Damgaard, CC BY-NC-ND 3.0 (2014).
Melichar, L. Monographie der Acanaloniiden und Flatiden (Homoptera) (Fortsetzung). Ann. k.k Naturhist Hofmus. Wien 17, 1–253 (1902).
Goodman, S. M. & Raherilalao, M. J. Atlas of selected land vertebrates of Madagascar i–iv+1–290 (Vahatra, 2014).
Xing, L. D., Stanley, E., Bai, M. & Blackburn, D. C. The earliest direct evidence of frogs in wet tropical forests from Cretaceous Burmese amber. Sci. Rep. 8, 8770, https://doi.org/10.1038/s41598-018-26848-w (2018).
Xing, L. D. et al. A Mid-Cretaceous embryonic-to-neonate snake in amber from Myanmar. Sci. Adv. 4, eaat5042, https://doi.org/10.1126/sciadv.aat5042 (2018).
Xing, L. D. et al. A feathered dinosaur tail with primitive plumage trapped in mid-Cretaceous amber. Curr. Biol. 26, 3352–3360, https://doi.org/10.1016/j.cub.2016.10.008 (2016).
Xing, L. D. et al. Mummified precocial bird wings in mid-Cretaceous Burmese amber. Nature Comm. 7, 12089, https://doi.org/10.1038/ncomms12089 (2016).
Xing, L. D. et al. A mid-Cretaceous enantiornithine (Aves) hatchling preserved in Burmese amber with unusual plumage. Gondw. Res. 49, 264–277, https://doi.org/10.1016/j.gr.2017.06.001 (2017).
Xing, L. D. et al. A flattened enantiornithine in mid-Cretaceous Burmese amber: morphology and preservation. Sci. Bull. 63, 235–243, https://doi.org/10.1016/j.scib.2018.01.019 (2018).
Daza, J. D., Stanley, E. L., Wagner, P., Aaron M. Bauer, A. M. & Grimaldi, D. A. Mid-Cretaceous amber fossils illuminate the past diversity of tropical lizards. Sci. Adv. 2(3), e1501080, https://doi.org/10.1126/sciadv.1501080 (2016).
Güntürkün, O. Sensory Physiology: Vision in Sturkie’s avian physiology 5th edition (ed. Whittow, G. C.) 1–19 (Academic Press, 2000).
Brusatte, S. L. Dinosaur palaeobiology i–xiii+1–322+15 pls (Wiley Blackwell, 2012).
Cronin, T. W., Johnsen, S., Marshall, N. J. & Warrant, E. J. Visual ecology i–xxii+1–405 (Princeton University Press, 2014).
Nyffeler, M., Şekercioğlu, Ç. H. & Whelan, C. J. Insectivorous birds consume an estimated 400–500 million tons of prey annually Sci. Nat. 105, 47, https://doi.org/10.1007/s00114-018-1571-z (2018).
Merilaita, S. & Lind, J. Background-matching and disruptive coloration, and the evolution of cryptic coloration. Proc. R. Soc. B 272, 665–670, https://doi.org/10.1098/rspb.2004.3000 (2005).
Stevens, M. & Cuthill, I. C. Disruptive coloration, crypsis and edge detection in early visual processing. Proc. R. Soc. B 273, 2141–2147, https://doi.org/10.1098/rspb.2006.3556 (2006).
Stevens, M., Winney, I. S., Cantor, A. & Graham, J. Outline and surface disruption in animal camouflage. Proc. R. Soc. B 276, 781–786, https://doi.org/10.1098/rspb.2008.1450 (2009).
Stevens, M. Cheats and deceits. How animals and plants exploit and mislead i–xvi+1–300 (Cambridge University Press, 2016).
Bell, J., Hancock, S., Kingdom, F. A. A. & Peirce, J. W. Global shape processing: which parts form the whole? J. Vis. 10, 1–13, https://doi.org/10.1167/10.6.16 (2010).
Nel, A. et al. Traits and evolution of wing venation pattern in paraneopteran insects. J. Morphol. 273(5), 480–506, https://doi.org/10.1002/jmor.11036 (2012).
Bourgoin, T. et al. From micropterism to hyperpterism: recognition strategy and standardized homology-driven terminology of the forewing venation patterns in planthoppers (Hemiptera: Fulgoromorpha). Zoomorphol. 134, 63–77, https://doi.org/10.1007/s00435-014-0243-6 (2015).
Ryan, W. B. F. et al. Global multi-resolution topography synthesis. Geochem Geophys. 10(3), 395–397, https://doi.org/10.1029/2008GC002332 (2009).
This research was supported by the National Natural Science Foundation of China (41702018, 41790452), State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) (No. 173112), the China Postdoctoral Science Foundation (No. 2017M610955) awarded to T.J., the National Natural Science Foundation of China (41572010, 41622201, 41688103), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB26000000) awarded to B.W., and it was also supported by Chinese Academy of Sciences President’s International Fellowship Initiative (No. 2017VBA0024) awarded to J.S. We would like to thank Mr. Anders L. Damgaard, Copenhagen, Denmark (https://amber-inclusions.dk) and Mr. Paul Bertner, British Columbia, Canada (https://rainforests.smugmug.com/) for data and help with their excellent photos of subfossil and fossil flatoidinids. We thank Mr. Dinghua Yang for the artistic reconstruction of the habitat and specimen.
The authors declare no competing interests.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Jiang, T., Szwedo, J. & Wang, B. A unique camouflaged mimarachnid planthopper from mid-Cretaceous Burmese amber. Sci Rep 9, 13112 (2019) doi:10.1038/s41598-019-49414-4