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

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 o...

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Autores Principales: Cadena, Edwin A., Jaramillo, Carlos A., Bloch, Jonathan I.
Formato: Capítulo de libro (Book Chapter)
Lenguaje:Inglés (English)
Publicado: Springer 2012
Materias:
Acceso en línea:https://repository.urosario.edu.co/handle/10336/28872
https://doi.org/10.1007/978-94-007-4309-0_8
id ir-10336-28872
recordtype dspace
spelling ir-10336-288722020-08-28T15:50:18Z New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution Nuevo material de la tortuga platychelyid Notoemys zapatocaensis del Cretácico temprano de Colombia; implicaciones para comprender la evolución de pleurodira Cadena, Edwin A. Jaramillo, Carlos A. Bloch, Jonathan I. Rosablanca formation South America Valanginian Zapatoca 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. 2012-09-01 2020-08-28T15:49:58Z info:eu-repo/semantics/bookPart info:eu-repo/semantics/publishedVersion ISBN: 978-94-007-4308-3 EISBN: 978-94-007-4309-0 https://repository.urosario.edu.co/handle/10336/28872 https://doi.org/10.1007/978-94-007-4309-0_8 eng info:eu-repo/semantics/restrictedAccess application/pdf Springer Morphology and Evolution of Turtles
institution EdocUR - Universidad del Rosario
collection DSpace
language Inglés (English)
topic Rosablanca formation
South America
Valanginian Zapatoca
spellingShingle Rosablanca formation
South America
Valanginian Zapatoca
Cadena, Edwin A.
Jaramillo, Carlos A.
Bloch, Jonathan I.
New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
description 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.
format Capítulo de libro (Book Chapter)
author Cadena, Edwin A.
Jaramillo, Carlos A.
Bloch, Jonathan I.
author_facet Cadena, Edwin A.
Jaramillo, Carlos A.
Bloch, Jonathan I.
author_sort Cadena, Edwin A.
title New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
title_short New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
title_full New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
title_fullStr New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
title_full_unstemmed New material of the platychelyid turtle Notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
title_sort new material of the platychelyid turtle notoemys zapatocaensis from the early cretaceous of colombia; implications for understanding pleurodira evolution
publisher Springer
publishDate 2012
url https://repository.urosario.edu.co/handle/10336/28872
https://doi.org/10.1007/978-94-007-4309-0_8
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