Two new species of the side necked turtle genus,Bairdemys (Pleurodira, Podocnemididae), from the Miocene of Venezuela

Gaffney, Eugene S.; Scheyer, Torsten M.; Johnson, Kenneth G.; Bocquentin, Jean; Aguilera, Orangel A.

doi:10.1007/bf02988411

Cited by 17 publications

(28 citation statements)

References 11 publications

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“…PREVIOUS WORK: Gaffney et al (2008). DISCUSSION: This specimen is described and figured in Gaffney et al (2008). The small size, flatter triturating surface, and extensive temporal and cheek emargination provide ready distinction of this species from the other species of Bairdemys.…”

Section: Bairdemys Hartsteinimentioning

confidence: 96%

“…REFERRED MATERIAL: None. PREVIOUS WORK: Gaffney et al (2008). DISCUSSION: This specimen is described and figured in Gaffney et al (2008).…”

Section: Bairdemys Hartsteinimentioning

confidence: 99%

“…Bairdemys, species indeterminate SPECIMEN: AMNH 30000, a poorly preserved skull and partial carapace (Gaffney et al, 2008 der''; chelys, Greek ''turtle,'' in allusion to the large size of the skull.…”

Section: Bairdemys Hartsteinimentioning

confidence: 99%

“…The skulls of the species of Bairdemys have already been described and figured in detail (Gaffney and Wood, 2002;Gaffney et al, 2008), and these will not be repeated here. It is assumed that the reader is familiar with and has available these papers, which are relied upon for comparisons in the descriptions below.…”

Section: Cranial Morphology Of the Tribe Stereogenyinimentioning

confidence: 99%

“…As part of our Podocnemididae project, the reader is directed to earlier papers on podocnemidids in this series: Gaffney et al (1998), , Gaffney and Wood (2002), Gaffney and Forster (2003), Gaffney et al (2006), Gaffney et al (2008), and Meylan et al (2009). The cranial morphology of turtles and an illustrated compilation of morphologic terminology can be found in Gaffney (1972Gaffney ( , 1979.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of the Side-Necked Turtles: The Family Podocnemididae

Gaffney

Meylan

Wood

et al. 2011

Bulletin of the American Museum of Natural History

Self Cite

129

351

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Section: Bairdemys Hartsteinimentioning

confidence: 96%

“…REFERRED MATERIAL: None. PREVIOUS WORK: Gaffney et al (2008). DISCUSSION: This specimen is described and figured in Gaffney et al (2008).…”

Section: Bairdemys Hartsteinimentioning

confidence: 99%

Section: Bairdemys Hartsteinimentioning

confidence: 99%

Section: Cranial Morphology Of the Tribe Stereogenyinimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evolution of the Side-Necked Turtles: The Family Podocnemididae

Gaffney

Meylan

Wood

et al. 2011

Bulletin of the American Museum of Natural History

Self Cite

129

351

View full text Add to dashboard Cite

Divergent palate morphology in turtles and birds correlates with differences in proliferation and BMP2 expression during embryonic development

2013

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During embryonic development, amniotes typically form outgrowths from the medial sides of the maxillary prominences called palatal shelves or palatine processes. In mammals the shelves fuse in the midline and form a bony hard palate that completely separates the nasal and oral cavities. In birds and lizards, palatine processes develop but remain unfused, leaving a natural cleft. Adult turtles do not possess palatine processes and unlike other amniotes, the internal nares open into the oral cavity. Here we investigate craniofacial ontogeny in the turtle, Emydura subglobosa to determine whether vestigial palatine processes develop and subsequently regress, or whether development fails entirely. We found that the primary palate in turtles develops similarly to other amniotes, but secondary palate ontogeny diverges. Using histology, cellular dynamics and in situ hybridization we found no evidence of palatine process development at any time during ontogeny of the face in the turtle. Furthermore, detailed comparisons with chicken embryos (the model organism most closely related to turtles from a molecular phylogeny perspective), we identified differences in proliferation and gene expression patterns that correlate with the differences in palate morphology. We propose that, in turtles, palatine process outgrowth is never initiated due to a lack of mesenchymal bone morphogenetic protein 2 (BMP2) expression in the maxillary mesenchyme, which in turn fails to induce the relatively higher cellular proliferation required for medial tissue outgrowth. It is likely that these differences between turtles and birds arose after the divergence of the lineage leading to modern turtles.

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