File:Parallel trends of body fineness evolution in pelagic vertebrates.jpg

English: Parallel trends of body fineness evolution in pelagic Arthrodira, Ichthyopterygia, Scombridae, and Chondrichthyes (Lamniformes). A–B, Arthrodira; C–D, Ichthyopterygia; E–F, Scombridae; G–H, Lamniformes. In the case of E, all scombrids are open water fishes to some degree but there is a distinct difference in body shape between coastal (neritic) non-thunnins like Scomber and oceanic (pelagic) thunnins. Note that while some features in Dunkleosteus are well-supported (fineness ratio, pelvic fin size) and others have some anatomical constraints (dorsal fin position, caudal fin span), others are inferred approximations requiring further study (caudal peduncle height); see Table 1. A–B, present study; C–D modified from McGowan and Motani (2003); E, drawn from USNM 25256 in Goode (1884), published in the public domain by NOAA; F drawn from measurements in Rivas (1955) and Russell (1934); G redrawn from 153 TL specimen collected by F.H. Mollen (ERB 1183; Mollen, 2019); H drawn from measurements of MZL 23981 in De Maddalena et al. (2003).