Fig. 4 in An enigmatic chondrichthyan with Paleozoic affinities from the Lower Triassic of western Canada

Fig. 4. Listracanthus pectenatus sp. nov., Lower Triassic, Wapiti Lake, British Columbia. Specimen UALVP 46551 showing morphological details of a large denticle (type I). A. A complete large denticle. Large denticles may vary in length, width and curvature. B. The apex of a large denticle with the fulcral ridges arranged like a "tuft". C. The posterior border as preserved in the same specimen. Note that each straight process possesses a striated shaft (1) and a triangular base (2) lateral to the process (see also thin sections in Fig. 7). D. Detail of postero−basal corner of the posterior border.