Abstract
A new species of a long-necked chelid from the uppermost Cretaceous (Campanian–Maastrichtian) is presented in this contribution. Yaminuechelys sulcipeculiaris sp. nov. is found in outcrops of the La Colonia Formation in the northeast part of Chubut province, Argentina. This new species is mainly represented by carapacial, plastral, and postcranial remains (vertebrae and long bones). It was assigned to Yaminuechelys because it presents characters shared with the species Yaminuechelys gasparinii de la Fuente, Lapparent de Broin, and Manera de Bianco, 2001 and Yaminuechelys maior (Staesche, 1929). Those characters are a large shell with irregular polygons distributed on the external surface, the difference in length between the anterior and posterior peripheral bones, and the neural series separated from the suprapygal bones. Other characters, like the position of the sulcus between vertebral 5 and marginal 12 crossing the suprapygal and the location of the sulcus between the vertebral 5 and the marginal 11 crossing the costal 8 and suprapygal, suggest it is a new species. According to the phylogenetic analysis performed, the new species forms a monophyletic group together with Y. maior, and Y. gasparinii. The survival of Yaminuechelys to the K/Pg extinction event is also discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.