Two halves make a Holotype: two hundred years between discoveries

Parris, David C.; Schein, Jason P.; Daeschler, Edward B.; Gilmore, Edward S.; Poole, Jason C.; Pellegrini, Rodrigo

doi:10.1635/053.163.0105

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…They did not attempt any further taxonomic attribution. The morphology of the humerus of IGVR 91032 is typical for the Chelonioidea (the thalassic type humeri as described by Weiland, 1900; see also Młynarsky, 1976;Hirayama, 1994Hirayama, , 1997Wyneken, 2001;Parris et al, 2014): longer than femur, with a nearly straight shaft, and with the lateral process located distal to the caput humeri (Chesi and Delfino, 2007;Hirayama, 1994). Other features supporting the referral to the Chelonioidea, besides the fact that the specimen is preserved in marine deposits, are elongated metapodials and phalanges of digits I-III lacking movable articulations and scute sulci on plastron absent (Chesi and Delfino, 2007;Hirayama, 1994Hirayama, , 1998Lehman and Tomlinson, 2004).…”

Section: Discussionmentioning

confidence: 83%

“…and the width of their cusp in anterior view were taken by a micrometer mounted on a Leica MZ16 stereomicroscope. Capellini (1884Capellini ( , 1898, Hay (1908), Hirayama (1992Hirayama ( , 1994Hirayama ( , 1997Hirayama ( and 1998, Kapuścińska and Machalski (2015), Lehman and Tomlinson (2004), Młynarsky (1976), Mulder (2003, Parris et al (2014), Villa et al (2014), Wieland (1900Wieland ( , 1906, Wyneken (2001Wyneken ( , 2003, Zangerl and Sloan (1960) were used for the comparison and taxonomic identification of the turtle remains. Shark body length (TL) was estimated from individual vertebral centrum diameter (CD) using the following formulas taken from Shimada (2008) and Gottfried et al (1996) respectively).…”

Section: Shark and Turtlementioning

confidence: 99%

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Direct evidence of trophic interaction between a large lamniform shark, Cretodus sp., and a marine turtle from the Cretaceous of northeastern Italy

Amalfitano

Vecchia²,

Giusberti

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Discussionmentioning

confidence: 83%

Section: Shark and Turtlementioning

confidence: 99%

Direct evidence of trophic interaction between a large lamniform shark, Cretodus sp., and a marine turtle from the Cretaceous of northeastern Italy

Amalfitano

Vecchia²,

Giusberti

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Based solely on humeral morphology, A . mortoni has been hypothesized as a member of either Protostegidae [ 1 , 62 ] or Cheloniidae [ 63 ] but until more material of this species is recovered and the species’ phylogenetic placement formally tested, we conservatively exclude this specimen from any discussions pertaining to the cladistics or paleobiogeography of Cretaceous chelonioids sensu stricto given the possibility that A . mortoni may not belong to this clade.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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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.

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