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[dinosaur] Peritresius martini, new Cretaceous turtle from Alabama + New fossil sites from Romualdo Formation, Araripe Basin, Brazil (free pdfs)

Ben Creisler

New non-dino papers:

Free pdf:

Peritresius martini sp. nov.Â

Andrew D. Gentry, James F. Parham, Dana J. Ehret & Jun A. Ebersole (2018)
A new species of Peritresius Leidy, 1856 (Testudines: Pan-Cheloniidae) from the Late Cretaceous (Campanian) of Alabama, USA, and the occurrence of the genus within the Mississippi Embayment of North America.Â
PLoS ONE 13(4): e0195651.
doi:Â https://doi.org/10.1371/journal.pone.0195651

Late Cretaceous members of Peritresius belong to a diverse clade of marine adapted turtles currently thought to be some of the earliest representatives of the lineage leading to modern hard-shelled sea turtles (Pan-Cheloniidae). Prior studies have suggested that Peritresius was monospecific, with a distribution restricted to Maastrichtian deposits in North America. However, new Peritresius specimens identified from Alabama and Mississippi, USA, show that the genus contains two taxa, Peritresius ornatus, and a new species Peritresius martini sp. nov. These two taxa are characterized by the presence of a generally cordiform carapace with moderately serrated peripherals, well-developed ventral flanges beginning at the third peripheral, squarish umbilical and lateral plastral fontanelles, and a narrow bridge formed by the contact between the hyoplastron and hypoplastron. Peritresius martini sp. nov. can be distinguished by its lack of dermal ornamentation and the presence of a 'rib-free' 10th peripheral. These new specimens represent the first occurrences of Peritresius from the Late Cretaceous Mississippi Embayment and extend the temporal range of this genus back to the early Campanian. When tested within a global phylogenetic context, Peritresius is placed on the stem of Cheloniidae (Pan-Cheloniidae) along with Ctenochelys and Allopleuron hofmanni. The heavily vascularized and uniquely sculptured dermal elements of P. ornatus are interpreted here as potentially relating to thermoregulation and therefore may have been one of the key factors contributing to the survival of Peritresius into the Maastrichtian, a period of cooling when other lineages of Campanian marine turtles (e.g., Protostegids, Toxochelys, and Ctenochelys) went extinct.




Also, another free pdf:

Rudah Ruano Cavalcanti Duque & Alcina MagnÃlia Franca Barreto (2018)
Novos SÃtios FossilÃferos da FormaÃÃo Romualdo, CretÃceo Inferior, Bacia do Araripe, Exu, Pernambuco, Nordeste do Brasil.
New Fossiliferous Sites of the Romualdo Formation, Lower Cretaceous, Araripe Basin, Exu, Pernambuco, Northeast of Brazil.
AnuÃrio do Instituto de GeociÃncias 41(1): 5-14

Here are new and old inventory of fossiliferous sites in the Romualdo Formation, Albian of the Araripe Basin, in the municipality of Exu, Pernambuco, Northeast of Brazil, with the survey of its fossiliferous diversity, with emphasis on paleovertebrates. Seven localities were studied, and 16 taxa of paleovertebrates were identified, including fishes: Vinctifer comptoni, Rhacolepis buccalis, Calamopleurus cylindricus, Cladocyclus gardneri, Neoproscinetes penalvai, Paraelops cearenses, Tharrhias araripis, Notelops brama, Araripelepdotes temnurus, Brannerion sp. e Beurlenichthys ouricuriensis; new occurrences of pterosaurs Anhangueridae and; chelonians (Araripemys barretoi). The Romualdo Formation has been studied since 1800 and it is internationally recognized as FossillagerstÃtte. However, the Pernambuco region of the Araripe Basin lacks systematic studies when compared to the region of CearÃ, which indicates the need to register the occurrence of fossiliferous sites and diversity, contributing to the knowledge of vertebrate paleontology in the southwest portion of the Araripe Basin and expanding the paleontological collections of the state of Pernambuco.Â