Ontogeny of the cranial bones of the giant amazon river turtle Podocnemis expansa Schweigger, 1812 (Testudines, Podocnemididae)

Vieira, Lucélia Gonçalves; Santos, André Luíz Quagliatto; Lima, Fabiano Campos

doi:10.4025/actascibiolsci.v32i2.5777

Cited by 7 publications

(17 citation statements)

References 2 publications

(12 reference statements)

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“…In the present contribution, we provide for the first time a case study of the Standard Event System (SES) (Werneburg, 2009) to describe an embryonic series. While traditional turtle “model organisms” all belong to Cryptodira, species of which possess highly derived characters (Joyce, 2007; Scheyer, 2007), only few studies in comparative embryology have so far considered pleurodires (Eßwein, 1992; Sánchez‐Villagra et al, 2007; Vieira et al, 2007, 2009; Scheyer et al, 2008; Fabrezi et al, 2009; Bona and Alcalde, 2009). Here we describe and analyse the early development of the red‐bellied short‐necked turtle Emydura subglobosa (Krefft, 1876), which is a common carnivore species living in freshwater environments of Northern Australia and Papua New Guinea (Legler and Georges, 1993).…”

Section: Introductionmentioning

confidence: 99%

Embryogenesis and ossification of Emydura subglobosa (Testudines, Pleurodira, Chelidae) and patterns of turtle development

Werneburg

Hugi

Müller

et al. 2009

Developmental Dynamics

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Using the Standard Event System (SES) to study patterns of vertebrate development, we describe a series of 17 embryos of the pleurodire turtle Emydura subglobosa. Based on a sequence heterochrony analysis including 23 tetrapod taxa, we identified autapomorphic developmental shifts that characterise Testudines, Cryptodira, and Pleurodira. The main results are that Testudines are characterised by an autapomorphic late neck development, whereas pleurodires and cryptodires show a different developmental timing of the mandibular process. Additionally, we described the ossification pattern of E. subglobosa and compared the data to those of five other turtles. Pleurodires show the epiplastron to ossify before or simultaneously with maxilla and dentary. In contrast, cryptodires show a later ossification of this bone. Because evolutionary developmental studies on turtles have previously focused only on ''model organisms'' that all belong to Cryptodira, we underline the necessity to include a pleurodire taxon for a more comprehensive, phylogenetically more informative approach.

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Section: Introductionmentioning

confidence: 99%

Embryogenesis and ossification of Emydura subglobosa (Testudines, Pleurodira, Chelidae) and patterns of turtle development

Werneburg

Hugi

Müller

et al. 2009

Developmental Dynamics

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“…Although some aspects of the developmental morphology of the chondrocranium are presented for Podocnemis expansa in Vieira et al . (), no actual mention is made of the taenia marginalis or taenia medialis as it focuses primarily on osteogenesis. Emydura subglobosa (Paluh and Sheil , figs 1–3) presents a taenia marginalis (their ‘tma’) that extends from the planum supraseptale and does contact the otic capsule in a condition like that of several other turtles [ Caretta caretta (Kuratani , , ) and perhaps Dermochelys coriacea (Bellairs and Kamal , fig.…”

Section: Discussionmentioning

confidence: 99%

Anatomy of the fully formed chondrocranium of Podocnemis unifilis (Pleurodira: Podocnemididae)

Sheil

Zaharewicz

2013

Acta Zoologica

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Sheil, C.A. and Zaharewicz, K. 2014. Anatomy of the fully formed chondrocranium of Podocnemis unifilis (Pleurodira: Podocnemididae). -Acta Zoologica (Stockholm) 95: 358-366.This study describes the anatomy of the chondrocranium of Podocnemis unifilis (Pleurodira, Podocnemididae), based on recently hatched specimens, and cleared and double-stained specimens. The orbitotemporal region is dramatically different from those observed for other species of turtles in that the: (1) planum supraseptale is greatly reduced and present only as tiny projections on the posterodorsal margin of the interorbital septum, (2) pila metoptica is free from all neighbouring structures and bifurcates distally, (3) pila antotica is greatly reduced, (4) foramina for optic nerve, ophthalmic artery and oculomotor nerves are open dorsally by virtue of this species lacking the taenia marginalis and taenia medialis, and (5) tectum synoticum is present and invested dorsally by the supraoccipital, despite the fact that this bone forms by replacement of the supraoccipital. The unique morphology of the pila metoptica is explained either as de novo formation of processes on the terminus of this cartilage or by retention of portions of the taenia medialis (anteriorly) and pila antotica or pila accessoria (posteriorly). Variation in the orbitotemporal region presented here is discussed for two other pleurodiran turtles (Phrynops hilarii and Emydura subglobosa) and briefly compared with the anatomy observed in Cryptodira.

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“…In contrast to the limited number of studies that are available for the embryology of squamates and crocodilians, numerous studies that cover all primary regions of tree space exist on the development of turtle limbs (Burke & Alberch, 1985;Rieppel, 1993a;Sheil, 2003a,b;Sheil & Greenbaum, 2005;S anchez-Villagra et al 2007aS anchez-Villagra et al ,b, 2008S anchez-Villagra et al , 2009Santos & Vieira, 2007;Sheil & Portik, 2008;Vieira et al 2009;Werneburg & S anchez-Villagra, 2009). Yet, with the exception of a single study (i.e.…”

Section: Parsimony and The Primary Homology Of The Hooked Elementmentioning

confidence: 99%

The hooked element in the pes of turtles (Testudines): a global approach to exploring primary and secondary homology

2013

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The hooked element in the pes of turtles was historically identified by most palaeontologists and embryologists as a modified fifth metatarsal, and often used as evidence to unite turtles with other reptiles with a hooked element. Some recent embryological studies, however, revealed that this element might represent an enlarged fifth distal tarsal. We herein provide extensive new myological and developmental observations on the hooked element of turtles, and re-evaluate its primary and secondary homology using all available lines of evidence. Digital count and timing of development are uninformative. However, extensive myological, embryological and topological data are consistent with the hypothesis that the hooked element of turtles represents a fusion of the fifth distal tarsal with the fifth metatarsal, but that the fifth distal tarsal dominates the hooked element in pleurodiran turtles, whereas the fifth metatarsal dominates the hooked element of cryptodiran turtles. The term 'ansulate bone' is proposed to refer to hooked elements that result from the fusion of these two bones. The available phylogenetic and fossil data are currently insufficient to clarify the secondary homology of hooked elements within Reptilia.

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Ontogeny of the cranial bones of the giant amazon river turtle Podocnemis expansa Schweigger, 1812 (Testudines, Podocnemididae)

Cited by 7 publications

References 2 publications

Embryogenesis and ossification of Emydura subglobosa (Testudines, Pleurodira, Chelidae) and patterns of turtle development

Embryogenesis and ossification of Emydura subglobosa (Testudines, Pleurodira, Chelidae) and patterns of turtle development

Anatomy of the fully formed chondrocranium of Podocnemis unifilis (Pleurodira: Podocnemididae)

The hooked element in the pes of turtles (Testudines): a global approach to exploring primary and secondary homology

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