{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Menon JCL"],"funding":["Swiss National Science Foundation"],"pagination":["27"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC11245440"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["143(1)"],"pubmed_abstract":["The early evolution of Pan-Chelonioidea (sea turtles) is poorly understood. This is in part due to the rarity of undeformed skulls of definitive early stem chelonioids. In this work, we redescribe the holotype of <i>Nichollsemys baieri</i> using µCT scans and segmentations of the skull. This fossil is the best 3D preserved skull of any Campanian sea turtle, and includes partial \"soft tissue\" preservation. <i>Nichollsemys</i> is morphologically similar but clearly distinct from <i>Toxochelys</i> spp., and both show a mosaic of plesiomorphic and derived chelonioid features. The internal cranial anatomy documents the presence of derived characters in <i>Nichollsemys baieri</i> that are absent in <i>Toxochelys</i> spp., such as the loss of the epipterygoids and the rod-like shape of the rostru"],"journal":["Swiss journal of palaeontology"],"pubmed_title":["New insights into the early morphological evolution of sea turtles by re-investigation of <i>Nichollsemys baieri</i>, a three-dimensionally preserved fossil stem chelonioid from the Campanian of Alberta, Canada."],"pmcid":["PMC11245440"],"funding_grant_id":["200021","202019","207377"],"pubmed_authors":["Menon JCL","Evers SW","Brinkman DB","Hermanson G","Joyce WG"],"additional_accession":[]},"is_claimable":false,"name":"New insights into the early morphological evolution of sea turtles by re-investigation of <i>Nichollsemys baieri</i>, a three-dimensionally preserved fossil stem chelonioid from the Campanian of Alberta, Canada.","description":"The early evolution of Pan-Chelonioidea (sea turtles) is poorly understood. This is in part due to the rarity of undeformed skulls of definitive early stem chelonioids. In this work, we redescribe the holotype of <i>Nichollsemys baieri</i> using µCT scans and segmentations of the skull. This fossil is the best 3D preserved skull of any Campanian sea turtle, and includes partial \"soft tissue\" preservation. <i>Nichollsemys</i> is morphologically similar but clearly distinct from <i>Toxochelys</i> spp., and both show a mosaic of plesiomorphic and derived chelonioid features. The internal cranial anatomy documents the presence of derived characters in <i>Nichollsemys baieri</i> that are absent in <i>Toxochelys</i> spp., such as the loss of the epipterygoids and the rod-like shape of the rostru","dates":{"release":"2024-01-01T00:00:00Z","publication":"2024","modification":"2025-04-18T21:42:47.589Z","creation":"2025-02-19T02:34:28.254Z"},"accession":"S-EPMC11245440","cross_references":{"pubmed":["39006951"],"doi":["10.1186/s13358-024-00323-8"]}}