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- W833585591 abstract "Stupendemys geographicus (Pleurodira: Pelomedusoides: Podocnemidae) is a giant turtle from the Miocene of Vene− zuela and Brazil. The bone histology of the carapace of two adult specimens from the Urumaco Formation is described herein, one of which is the largest of this species ever found. In order to determine phylogenetic versus scaling factors influencing bone histology, S. geographicus is compared with related podocnemid Podocnemis erythrocephala, and with fossil and Recent pelomedusoides taxa Bothremys barberi, Taphrosphys sulcatus, “Foxemys cf. F. mechinorum”, and Pelomedusa subrufa. Potential scaling effects on bone histology were further investigated by comparison to the Pleistocene giant tortoise Hesperotestudo (Caudochelys) crassiscutata and the Late Cretaceous marine protostegid turtle Archelon ischyros. A diploe structure of the shell with well developed external and internal cortices framing inte− rior cancellous bone is plesiomorphic for all sampled taxa. Similarly, the occurrence of growth marks in the shell ele− ments is interpreted as plesiomorphic, with the sampled neural elements providing the most extensive record of growth marks. The assignment of S. geographicus to the Podocnemidae was neither strengthened nor refuted by the bone his− tology. A reduced thickness of the internal cortex of the shell elements constitutes a potential synapomorphy of the Bothremydidae. S. geographicus and H. crassiscutata both express extensive weight−reduction through lightweight− construction while retaining form stability of the shell. The bone histology of A. ischyros presents features likely re− lated to an open marine lifestyle." @default.
- W833585591 created "2016-06-24" @default.
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- W833585591 date "2007-02-03" @default.
- W833585591 modified "2023-10-06" @default.
- W833585591 title "Carapace bone histology in the giant pleurodiran turtle Stupendemys geographicus: Phylogeny and function" @default.
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