A Review of the Fossil Record of Nonbaenid Turtles of the Clade Paracryptodira

Joyce, Walter G.; Anquetin, Jérémy

doi:10.3374/014.060.0204

Cited by 22 publications

(21 citation statements)

References 58 publications

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“…However, the exact shape of the emargination is unknown. In pleurosternids, the upper temporal emargination is at best poorly developed Kemp, 1975, 1976;Gaffney, 1979b;Joyce and Anquetin, 2019).…”

Section: Parietalmentioning

confidence: 99%

“…4C-D). It was reported that Pleurosternon bullockii and Glyptops ornatus lack a midline contact of the pterygoids due to a long ventral exposure of the parabasisphenoid that would reach the vomer anteriorly (Evans and Kemp, 1975;Gaffney, 1979b), but this may be a preservational artifact (Joyce and Anquetin, 2019). Anterolaterally, the pterygoid forms a well-developed processus pterygoideus externus.…”

Section: Pterygoidmentioning

confidence: 99%

“…The split between the two branches of the internal carotid artery (that is when the palatine branch is present; see Rollot et al, 2018) occurs within the bones and is therefore not visible in ventral view (Gaffney, 1979a;Joyce and Lyson, 2015;Joyce and Anquetin, 2019).…”

Section: Notes On the Internal Carotid Arterial System In Paracryptodiramentioning

confidence: 99%

“…The cranium of Pleurosternon bullockii was initially described as the new species Mesochelys durlstonensis by Evans and Kemp (1975), but following Gaffney and Meylan (1988) the two species were considered as synonyms. However, Milner (2004) was the first to really assess this synonymy (Joyce and Anquetin, 2019). The cranium of Dorsetochelys typocardium was initially described as the new species Dorsetochelys delairi by Evans and Kemp (1976) and was recently synonymized with the shell-based "Glyptops" typocardium (Pérez-García, 2014).…”

Section: Introductionmentioning

confidence: 99%

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The last surviving Thalassochelydia—A new turtle cranium from the Early Cretaceous of the Purbeck Group (Dorset, UK)

Anquetin¹,

André²

2020

Preprint

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Background. The mostly Berriasian (Early Cretaceous) Purbeck Group of southern England has produced a rich turtle fauna dominated by the freshwater paracryptodires Pleurosternon bullockii and Dorsetochelys typocardium. Each of these species is known by numerous relatively complete shells and by a single cranium. The two other turtles found in the Purbeck Group (Hylaeochelys belli, a species of uncertain affinities, and the terrestrial helochelydrid "Helochelydra" anglica) are known only from shell remains.Methods. In the present contribution, we describe a new turtle cranium from the Purbeck Group of Swanage, Dorset (southern England). We also explore the phylogenetic relationships of this new cranium and of Hylaeochelys belli in the context of a recently published global turtle matrix.Results. Before complete preparation, the new Purbeck cranium was provisionally referred to Dorsetochelys typocardium, but our analysis clearly contradicts a referral to this species in particular and to paracryptodires in general. In contrast, the new cranium shares a number of features with the Late Jurassic, coastal marine Thalassochelydia, including a posterolaterally open foramen palatinum posterius, a strong ridge on the posterior surface of the processus articularis of the quadrate, a strong posterior orientation of the processus articularis in ventral view, and a processus trochlearis oticum limited to the medial part of the otic chamber and bordered by a deep recess laterally. Our phylogenetic analysis confirms a placement of the new Purbeck cranium within the clade Thalassochelydia.Discussion. In terms of morphology, the new Purbeck cranium does not correspond to any known taxon. However, we refrain from naming a new species based on it because there is a good chance that this cranium actually belongs to the shell-based species Hylaeochelys belli (also recovered as a thalassochelydian in our phylogenetic analysis). Unfortunately, we lack any objective evidence to support this conclusion for the moment. In any case, the new Purbeck cranium confirms what others have previously suggested based on Hylaeochelys belli: thalassochelydian turtles survived the Jurassic-Cretaceous transition.

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Section: Parietalmentioning

confidence: 99%

Section: Pterygoidmentioning

confidence: 99%

Section: Notes On the Internal Carotid Arterial System In Paracryptodiramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The last surviving Thalassochelydia—A new turtle cranium from the Early Cretaceous of the Purbeck Group (Dorset, UK)

Anquetin¹,

André²

2020

Preprint

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“…Indeed, as the skull and referred shell are not particularly informative, both conclusions can be justified on the basis of OMNH 67133 (the holotype) alone, as this specimen exhibits the majority of informative character information. We summarize in the following section differences with all other currently recognized Late Jurassic to Early Cretaceous paracryptodires worldwide (Joyce and Lyson, 2015;Joyce and Anquetin, 2019).…”

Section: Alpha Taxonomymentioning

confidence: 94%

A new species of baenid turtle from the Early Cretaceous Lakota Formation of South Dakota

Joyce

Rollot

Cifelli³

2020

Foss. Rec.

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Abstract. Baenidae is a clade of paracryptodiran turtles known from the late Early Cretaceous to Eocene of North America. The proposed sister-group relationship of Baenidae to Pleurosternidae, a group of turtles known from sediments dated as early as the Late Jurassic, suggests a ghost lineage that crosses the early Early Cretaceous. We here document a new species of paracryptodiran turtle, Lakotemys australodakotensis gen. and sp. nov., from the Early Cretaceous (Berriasian to Valanginian) Lakota Formation of South Dakota based on a poorly preserved skull and two partial shells. Lakotemys australodakotensis is most readily distinguished from all other named Late Jurassic to Early Cretaceous paracryptodires by having a broad, baenid-like skull with expanded triturating surfaces and a finely textured shell with a large suprapygal I that laterally contacts peripheral X and XI and an irregularly shaped vertebral V that does not lap onto neural VIII and that forms two anterolateral processes that partially separate the vertebral IV from contacting pleural IV. A phylogenetic analysis suggests that Lakotemys australodakotensis is a baenid, thereby partially closing the previously noted gap in the fossil record.

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A pan‐chelydrid, Chelydropsis aubasi sp. nov., from the Middle Eocene (MP 15, early Bartonian) of Chéry‐Chartreuve, France

Joyce

Landréat²,

Rollot

2022

The Anatomical Record

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Snapping turtles (Pan‐Chelydridae) play an important role in modern ecosystems throughout North America, but their fossil record is notably poor. We here describe a new species of fossil pan‐chelydrid, Chelydropsis aubasi, from the Middle Eocene (MP15, Bartonian) of Chéry‐Chartreuve, Department of Aisne, France, based on a series of fragments that document most of the shell. The new species not only bridges the morphological gap between earlier pan‐chelydrids from North America and later pan‐chelydrids from Europe but also advances the arrival of the group from North America to Europe by at least 10 million years. Although pan‐chelydrids are notably absent from Early and Middle Eocene localities throughout Europe, the new fossil gives credence to the idea that pan‐chelydrids may have dispersed from North America to Europe in concert with other turtles during the Paleocene–Eocene Thermal Maximum, but remain undetected to date.

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A Review of the Fossil Record of Nonbaenid Turtles of the Clade Paracryptodira

Cited by 22 publications

References 58 publications

The last surviving Thalassochelydia—A new turtle cranium from the Early Cretaceous of the Purbeck Group (Dorset, UK)

The last surviving Thalassochelydia—A new turtle cranium from the Early Cretaceous of the Purbeck Group (Dorset, UK)

A new species of baenid turtle from the Early Cretaceous Lakota Formation of South Dakota

A pan‐chelydrid, Chelydropsis aubasi sp. nov., from the Middle Eocene (MP 15, early Bartonian) of Chéry‐Chartreuve, France

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