A new large panchelid turtle (Pleurodira) from the Loncoche Formation (upper Campanian-lower Maastrichtian) of the Mendoza Province (Argentina): Morphological, osteohistological studies, and a preliminary phylogenetic analysis

详细信息    查看全文

• 作者：Marcelo S. de la Fuente^a ; ^b ; ^{mdelafuente1910@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Ignacio Maniel^a ; ^b ; Juan Marcos Jannello^a ; ^b ; Juliana Sterli^b ; ^c ; Bernardo Gonzalez Riga^b ; ^d ; Fernando Novas^e ; ^b
• 关键词：Pleurodira ; Ranquil-Có ; locality ; Mendoza ; Upper Cretaceous ; Gondwana
• 刊名：Cretaceous Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：69
• 期：Complete
• 页码：147-168
• 全文大小：7131 K

文摘

A new genus and species of panchelid turtle (Mendozachelys wichmanni gen. et sp. nov.) from the upper Campanian–lower Maastrichtian Loncoche Formation (southern Mendoza Province, Argentina) is described here. This species is represented by only one complete and articulated large specimen (carapace length estimated in 950 mm) that was recovered from tidal flat deposits. A detailed morphological and osteohistological description is made, recognizing autapomorphic characters that allow differentiating this taxon from the rest of extant and extinct panchelids. Osteohistological characters suggest an aquatic to semi-aquatic life style for Mendozachelys wichmanni gen. et sp. nov. Phylogenetic analysis based on morphological data suggested that this new taxon is nested within crown Chelidae. Both phylogenetic signals (morphological and molecular) about the assessment of long-necked chelids monophyly or polyphyly are discussed.