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Chapitre D'ouvrage Année : 2021

Early amniotes and their close relatives

Résumé

This chapter offers an overview of the known diversity of diadectomorph and early sauropsid tooth and bone histology. Despite the broad ecological range occupied by early amniotes and closely related taxa described herein, general histological patterns can be deciphered. Long bone shafts comprise mostly primary lamellar or parallel-fibered periosteal tissue. Evidence of cyclical growth is widespread and vascularization is usually sparse and formed of longitudinal simple vascular canals and primary osteons, but it can be moderately dense and more complex in some taxa of large body size (e.g., pareiasaurs), or “disaster taxa” that survived the Permo-Triassic extinction event. From a paleobiological point of view, bone histology suggests that most early sauropsids (except maybe some pareiasaurs) had a general ectothermic metabolism. Moreover, it becomes clear that the traditional morphological divisions of tooth insertions (i.e., acrodont, pleurodont and thecodont) derived from the analysis of extant vertebrates cannot describe the situation observed among early vertebrates. The occurrence of some features (e.g., alveolae, specialized alveolar bone and cementum) in early taxa such as mesosaurs and captorhinids suggests that these tissues may have been widespread among early amniotes, rather than exclusive to mammals and archosaurs.
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Dates et versions

hal-03500073 , version 1 (21-12-2021)

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Aurore Canoville, Michel Laurin, Armand de Ricqlès. Early amniotes and their close relatives. de Buffrénil, V.; de Ricqlès, A.,; Zylberberg, L.; Padian, K.; Laurin, M.; Quilhac, A. Vertebrate Skeletal Histology and Paleohistology, CRC Press, pp.363-384, 2021, 9780367700867. ⟨10.1201/9781351189590-18⟩. ⟨hal-03500073⟩
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