Oldest known sea turtle

Hirayama, Ren

doi:10.1038/33669

Cited by 216 publications

(251 citation statements)

References 4 publications

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“…In a few studies, thalassochelydian turtles have been found to be closely related to Cretaceous turtles, in particular the Early Cretaceous protostegid Santanachelys gaffneyi Hirayama, 1998 and the Early Cretaceous sandownid Sandownia harrisi Meylan et al, 2000(Hirayama 1998Meylan et al 2000;Joyce 2007;Mateus et al 2009;Sterli et al 2013;Anquetin et al 2015). If these connections are corroborated by future work, Thalassochelydia may become significantly more speciose than presented herein by including species from the Cretaceous and Paleogene.…”

Section: Phylogenetic Relationshipsmentioning

confidence: 62%

A review of the fossil record of turtles of the clade Thalassochelydia

Anquetin¹,

Püntener²,

Joyce³

2017

Preprint

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POSTPRINTThis is a postprint of the following peer-reviewed publication: AbstractThe Late Jurassic (Oxfordian to Tithonian) fossil record of Europe and South America has yielded a particularly rich assemblage of aquatic pan-cryptodiran turtles that are herein tentatively hypothesized to form a monophyletic group named Thalassochelydia. Thalassochelydians were traditionally referred to three families, Eurysternidae, Plesiochelyidae, and Thalassemydidae, but the current understanding of phylogenetic relationships is insufficient to support the monophyly of either group. Given their pervasive usage in the literature, however, these three names are herein retained informally. Relationships with marine turtles from the Cretaceous have been suggested in the past, but these hypotheses still lack strong character support. Thalassochelydians are universally found in near-shore marine sediments and show adaptations to aquatic habitats, but isotopic evidence hints at a broad spectrum of specializations ranging from freshwater aquatic to fully marine. A taxonomic review of the group concludes that of 68 named taxa, 27 are nomina valida, 18 are nomina invalida, 18 are nomina dubia, and 5 nomina oblita.

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Section: Phylogenetic Relationshipsmentioning

confidence: 62%

A review of the fossil record of turtles of the clade Thalassochelydia

Anquetin¹,

Püntener²,

Joyce³

2017

Preprint

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“…a-g Modified from Camp (1942), Andrews (1910), Carroll (1988, Wieland (1909), McGowan and Motani (2002), Kuhn-Schnyder (1952), Carroll (1985, and Hua and Buffrenil (1996), respectively. Body outlines are inaccurate Two of the four major groups appeared in the Early Triassic McGowan and Motani 2002), whereas the others are first recorded from the Early (Chelonioidea) and Late (Mosasauridae) Cretaceous (Hirayama 1998;Jacobs et al 2005). The groups that emerged in the Jurassic, namely Pleurosauridae (Fig.…”

Section: Mesozoic Marine Reptilesmentioning

confidence: 99%

“…However, the oldest fossil record of the group comes from the latest Aptian (Lower Cretaceous, about 108 million years ago), and the lineage most likely started even earlier. The oldest known sea turtle Santanachelys was only about 20 centimeters long (Hirayama 1998).…”

Section: Chelonioideamentioning

confidence: 99%

The Evolution of Marine Reptiles

2009

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Reptiles have repeatedly invaded marine environments despite their physiological constraints as air breathers. Marine reptiles were especially successful in the Mesozoic as major predators in the sea. There were more than a dozen groups of marine reptiles in the Mesozoic, of which four had more than 30 genera, namely sauropterygians (including plesiosaurs), ichthyopterygians, mosasaurs, and sea turtles.

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“…Sea turtles (Chelonioidea) have a long fossil record stretching back to the late Early Cretaceous (late Aptian/early Albian, ca 105 Myr ago; see Hirayama 1998). However, their early evolutionary history remains largely unknown, as recent phylogenies do not recognize any definitive stem-group taxa.…”

Section: Introductionmentioning

confidence: 99%

A primitive protostegid from Australia and early sea turtle evolution

Kear

Lee

2005

Biol. Lett.

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Sea turtles (Chelonioidea) are a prominent group of modern marine reptiles whose early history is poorly understood. Analysis of exceptionally well preserved fossils of Bouliachelys suteri gen. et sp. nov., a large-bodied basal protostegid (primitive chelonioid) from the Early Cretaceous (Albian) of Australia, indicates that early sea turtles were both larger and more diverse than previously thought. The analysis implies at least five distinct sea turtle lineages existed around 100 million years ago. Currently, the postcranially primitive Ctenochelys and Toxochelys are interpreted as crown-group sea turtles closely related to living cheloniids (e.g. Chelonia ); in contrast, the new phylogeny suggests that they are transitional (intermediate stem-taxa) between continental testudines and derived, pelagic chelonioids.

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Oldest known sea turtle

Cited by 216 publications

References 4 publications

A review of the fossil record of turtles of the clade Thalassochelydia

A review of the fossil record of turtles of the clade Thalassochelydia

The Evolution of Marine Reptiles

A primitive protostegid from Australia and early sea turtle evolution

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