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A new soft-shelled trionychid turtle of the genus Khunnuchelys from the Upper Cretaceous Bostobe Formation of Kazakhstan

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Danilov I. G., Vitek N. S., Averianov A. O., Glinskiy V. N.

Acta Palaeontologica Polonica

2015

tom 60

nr 1

Previously unpublished trionychid turtle material from the Upper Cretaceous (Santonian–lower Campanian) Bostobe Formation from the Baybishe and Baykhozha localities in Kazakhstan is described. The material represents a new species of Khunnuchelys, a large, skull-based clade of Cretaceous Asian trionychids. Concordant with other partial skulls and fragmentary specimens described previously, Khunnuchelys lophorhothon sp. nov. has the unusual features of a beaklike maxilla and a vaulted, expanded triturating surface. In addition, the specimens reveal novel features including a constricted skull roof. Although estimates of the length of the carapace differ depending on estimation method, the skull belonged to a turtle of comparable size to the shell-based species “Trionyx” kansaiensis from the same formation. It is likely that K. lophorhothon and “T.” kansaiensis are synonymous, but this can be proved only by a find of associated skull and shell material.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Averianov A. O.

1 Danilov I. G.

1 Glinskiy V. N.

1 Vitek N. S.

1 2015

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A new soft-shelled trionychid turtle of the genus Khunnuchelys from the Upper Cretaceous Bostobe Formation of Kazakhstan