Abstract
Abstract Chelonioid sea turtles (Order Testudinata; Superfamily Chelonioidea) first appear in the early Cretaceous (AptianâAlbian). Their long fossil record is excellent compared to most marine tetrapods. Nonetheless, there has been no inclusive attempt to provide an analysis of cladistic relationships among this group. In this paper, the following chelonioid classification is proposed, based on 76 characters among 20 fossil and six living wellâ represented genera: Family Cheloniidae (Coniacian to Recent); Toxochelys, Ctenochelys, Osteopygis, Erquelinnesia, Allopleuron, Argillochelys, Puppigerus, Eochelone, Syllomus, Natator, Eretmochelys, Chelonia, Caretta, Lepidochelys Family Protostegidae (Aptian to Maastrichtian?); âSantana new protostegidâ,Rhinochelys, Notochelone, Desmatochelys, Chelosphargis, Protostega, Archelon Family Dermochelyidae (Santonian? to Recent); Corsochelys, âHMG new dermoâchelyidâ, Eosphargis, Psephophorus, Dermochelys.
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