Osteohistology and microanatomy of a new specimen of Cearachelys placidoi (Testudines: Pleurodira) a side-necked turtle from the lower Cretaceous of Brazil.

Autor: Sena MVA; Programa de Pós-Graduação em Geociências (PPGEOC), Departamento de Geologia, Universidade Federal de Pernambuco, Avenida Prof. Moraes Rego, 1235, Recife, Pernambuco, 50670-901, Brazil.; Centro Universitário da Vitória de Santo Antão, Loteamento São Vicente Ferrer, 71, Vitória de Santo Antão, Pernambuco, 55610-050, Brazil., Bantim RAM; Laboratório de Paleontologia da URCA, Universidade Regional do Cariri, Rua Carolino Sucupira, s/nº, Crato, Ceará, 63105-000, Brazil., Saraiva AÁF; Laboratório de Paleontologia da URCA, Universidade Regional do Cariri, Rua Carolino Sucupira, s/nº, Crato, Ceará, 63105-000, Brazil., Sayão JM; Laboratório de Paleobiologia e Paleogeografia Antártica, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista s/nº, Rio de Janeiro, Rio de Janeiro, 20940-040, Brazil., Oliveira GR; Laboratório de Paleontologia & Sistemática, Departamento de Biologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/nº, Recife, Pernambuco, 52171-900, Brazil.
Jazyk: angličtina
Zdroj: Anatomical record (Hoboken, N.J. : 2007) [Anat Rec (Hoboken)] 2021 Jun; Vol. 304 (6), pp. 1294-1304. Date of Electronic Publication: 2020 Nov 06.
DOI: 10.1002/ar.24556
Abstrakt: Pelomedusoides had a recognised diverse Early Cretaceous fauna of turtles in Northeast Brazil. Within them, the bothremydid Cearachelys placidoi has a relatively abundant record. This diversity contrasts with the scarcity of osteohistological studies in this group. The relatively well-preserved shell of C. placidoi (UFRPE 5600), from the Aptian age of Araripe Basin, is studied here for the purpose of filling this gap. We performed the osteohistological description of the plastron of a new specimen of C. placidoi. Also, to conduct a comparative study, we carried out histological sections in bones of the recent chelid Phrynops sp. Our histological findings indicate similarities between the histological pattern of freshwater turtles and the coastal marine C. placidoi. Moreover, osteohistological features imply metaplastic incorporation of dermal interwoven structural fiber bundles. Lastly, the xiphiplastron of C. placidoi shows an increase of bone compactness over its craniocaudal axis. This microanatomical feature is exclusive to Cearachelys so far.
(© 2020 American Association for Anatomy.)
Databáze: MEDLINE
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