The most complete specimen of Kawanectes lafquenianum (Sauropterygia, Plesiosauria): New data on basicranial anatomy and possible sexual dimorphism in elasmosaurids

被引：7

作者：

O'Gorman, Jose P. ^{[1
,2
]}

机构：

[1] Univ Nacl La Plata, Div Paleontol Vertebrados, Museo La Plata, Paseo Bosque S-N,B1900FWA, La Plata, Argentina

[2] CONICET Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, Argentina

来源：

CRETACEOUS RESEARCH | 2021年 / 125卷

关键词：

Elasmosauridae; Upper Cretaceous; La Colonia Formation; Plesiosauria; LA COLONIA FORMATION; SIZE DIMORPHISM; LIFE-HISTORY; BODY-SIZE; REPTILIA; PATAGONIA; ANTARCTICA; EVOLUTION; INFORMATION; ALLOMETRY;

D O I：

10.1016/j.cretres.2021.104836

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Elasmosaurids are a cosmopolitan group of plesiosaurians that radiated during the Late Cretaceous. A new specimen of the small sized elasmosaurid Kawanectes lafquenianum is described here. New features of the basicranium and palate are added: basioccipital tubers with distal end deeply excavated, basioccipital ventral flat plate below occipital condyle, absence of posterior interpterygoid symphysis, parasphenoid extended caudally to the posterior margin of basioccipital condyle, craniocaudally short ventral keel of parasphenoid. Differences recorded between the specimens referred to K. lafquenianum (ilium shape, relative humerus to femur size and sacral centrum proportions) are described. Different explanations of these differences are discussed, concluding that sexual dimorphism is the most plausible explanation. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：19