FIGURE 1. Reconstruction of Psarolepis, a 400-million-year-old sarcopterygian-like fish with an unusual combination of osteichthyan and non-osteichthyan features.
From the following article:
A primitive fossil fish sheds light on the origin of bony fishes
Min Zhu, Xiaobo Yu and Philippe Janvier
Nature 397, 607-610(18 February 1999)
doi:10.1038/17594
a, Head and anterior part of the fish with tentatively positioned median fin spine. b, Anterior view of the skull and lower jaws (from ref. 3). Scale bar, 5 mm. c, Median fin spine (from ref. 4). d, Shoulder girdle with pectoral spine, based on specimens shown in Fig. 2. e, Cheek plate with maxillary and preopercular, based on specimens shown in Fig. 3. Surface ornamentation of the cheek plate is omitted to show the pattern of sensory canals. Most Psarolepis specimens derive from four beds at the same locality in Qujing, Yunnan, China.
