Mesozoic hybodont sharks from Asia and their relationships to the genus Ptychodus

Gilles Cuny


The affinities of the selachian genus Ptychodus is discussed and Hemiptychodus is here re-introduced as a subgenus characterized by unusual tooth ornamentation pattern.An overview of Asian hybodont genera showing tooth ornamentations pattern similar to that of Ptychodus is given. Lacking a triple-layered enameloid, Ptychodus may be a hybodont shark or a batoid, but both hypotheses are not without problems. Based only on dental characters, hybodont affinities for this genus are favoured here, although the evidence to do so is indeed weak.


Jurassic, Cretaceous, Hybodontiformes, Ptychodontidae, Asia

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