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[dinosaur] Trematosaurus (temnospondyl) osteology + turtles from Araripe Basin, Brazil




Ben Creisler
bcreisler@gmail.com

Some recent non-dino papers:

Free pdf:

Rainer R. Schoch (2019)
Osteology of the temnospondyl Trematosaurus brauni Burmeister, 1849 from the Middle Buntsandstein of Bernburg, Germany.
Palaeodiversity, 12(1): 41-63
doi: Âhttps://doi.org/10.18476/pale.v12.a4 Â
https://bioone.org/journals/Palaeodiversity/volume-12/issue-1/pale.v12.a4/Osteology-of-the-temnospondyl-Trematosaurus-brauni-Burmeister-1849-from-the/10.18476/pale.v12.a4.full



The slender-skulled temnospondyl Trematosaurus brauni forms the most common tetrapod in the Early Triassic of Germany, and is documented by numerous finds from Merkel's Quarry at Bernburg (Saale). The revision of the available material includes 75 skulls with a size range between 10.9 and 41 cm skull length, and a small suite of postcranial elements. T. brauni is characterized by a temporal sulcus of lateral line with two portions, a well-established occipital sulcus, a preorbital region slightly shorter than half skull length, and a wide interorbital distance with very small rounded orbits. Individual variation was substantial, ranging from wide-triangular-skulled morphs to ones with slightly elongate preorbital region. Despite the size range, few ontogenetic changes have been identified: (1) the length of orbit decreased gently proportionally with size, and (2) the width of postorbital skull table relative decreased proportionally with size. Phylogenetic analysis finds T. brauni to nest with the very similar Trematosuchus well within a clade of slender-skulled trematosauroids. Together, the two genera form the sister taxon of Tertrema and the rostrum-bearing lonchorhynchines, whereas Trematolestes and Tertremoides assume a more basal position within a monophyletic Trematosauridae, which forms the sister taxon of the short-snouted metoposaurid relatives.


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Anny Rafaela de AraÃjo Carvalho, Gustavo Ribeiro Oliveira & Alcina Magnolia Franca Barreto (2019)
New occurrences of fossil Testudines of the Romualdo Formation, Aptian-Albian of the Araripe Basin, Pernambuco, Northeast Brazil.
Journal of South American Earth Sciences (advance online publication)
doi: https://doi.org/10.1016/j.jsames.2019.102211
https://www.sciencedirect.com/science/article/pii/S0895981119300343


Highlights

New specimens of turtles described for the Romualdo Formation (Aptian-Albian), Araripe Basin.
New contributions to the knowledge about the Santana Group biota.
First described Testudines from the municipality of Exu, Pernambuco State.
First specimens of fossil turtles of the Romualdo Formation with precise geographical and geological.

Abstract

So far, there are at least 22 species of fossil turtles formally described for Brazil, with the Araripe Basin being the second largest in Mesozoic diversity with five species, losing only to the Bauru Group, with six species. The material presented here refers to three fossil turtles (DGEO-CTG-UFPE 8470, DGEO-CTG-UFPE 8471, DGEO-CTG-UFPE 8932) from Romualdo, an Albian Formation of the Araripe Basin (Cretaceous), collected in municipalities of Pernambuco (PE). The DGEO-CTG-UFPE 8470 specimen was identified as Araripemys barretoi Price, 1973, and DGEO-CTG-UFPE 8471 and DGEO-CTG-UFPE 8932 as Cearachelys placidoi Gaffney et al., 2001, the first occurrence of this taxon in the state of Pernambuco. DGEO-CTG-UFPE 8470 and DGEO-CTG-UFPE 8932 are the first Testudines described from the municipality of Exu, (PE).




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