Fig. 1. Left lateral views of representative elasmobranch jaw suspensions. (A) Heterodontus, Heterodontiformes (hyostyly); (B) Heptranchias, Hexanchiformes (amphistyly); (C) Rhinobatos, Batoidea (euhyostyly). Articulation points are marked with arrows. C, ceratohyal; E, ethmoidal; H, hyomandibula; L, lower jaw; O, orbital; P, postorbital; U, upper jaw. Reproduced from Wilga (2002) with permission from Blackwell Publishing.