New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution

Edwin A. Cadena, Carlos A. Jaramillo, Jonathan I. Bloch

Research output: Chapter in Book/Report/Conference proceedingChapter

19 Scopus citations

Abstract

Notoemys zapatocaensis is the youngest representative of the Platychelyidae, a group of Late Jurassic-Early Cretaceous pleurodires. Here we describe two new specimens of this species represented by a partial carapace and a nearly complete articulated shell. Notoemys zapatocaensis is different from other platychelyid turtles in having: (1) two fairly reduced lateral tuberosities on the margin of the anterior plastral lobe, (2) a shallow notch on the posterolateral margin of the epiplastra, giving a convex posterolateral edge to this bone, (3) gular scales that are rectangular in shape and much wider than long, (4) a long intergular scale that has a slight medial contact with the pectorals, resulting in a complete separation of the humeral scales, (5) a central plastral fontanelle that projects posteriorly into the xiphiplastral region, (6) a very small marginal 3, (7) a slightly shorter neural 1 than neural 2, with an exclusive lateral contact with costal 1, resulting in a complete separation of neural 2 and costal 1, (8) narrower vertebral scales, and (9) peripheral 3 lacking a posteromedial contact with costal 2. Phylogenetic analysis indicates that N. zapatocaensis is a sister taxon of N. oxfordiensis, and that Proterochersis robusta can be resolved in two different positions in the testudines tree: (1) with Odontochelys semitestacea based on the fact that both taxa share two mesoplastra meeting at midline, or (2) as the most basal pleurodire, based on a suture articulation of pelvis to shell. Anal notch shape and potentially fontanelle size are indicators of sexual dimorphism in platychelyids.

Original languageEnglish (US)
Title of host publicationVertebrate Paleobiology and Paleoanthropology
PublisherSpringer
Pages105-120
Number of pages16
Edition9789400743083
DOIs
StatePublished - Jan 1 2013
Externally publishedYes

Publication series

NameVertebrate Paleobiology and Paleoanthropology
Number9789400743083
ISSN (Print)1877-9077

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Palaeontology

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