Cranial osteology, taxonomic reassessment, and phylogenetic relationships of the Early Cretaceous (Aptian-Albian) turtle Trinitichelys hiatti (Paracryptodira)

PeerJ, Journal Year: 2022, Volume and Issue: 10, P. e14138 - e14138

Published: Nov. 2, 2022

We describe the skull of Early Cretaceous (Aptian-Albian) baenid turtle Trinitichelys hiatti using micro-computed tomography to provide new insights into cranial anatomy basal baenids and evolution paracryptodires. show that validity vs Arundelemys dardeni still holds true, most known for which material is share an intriguing combination features are typical either Pleurosternidae or Baenidae, carotid system intermediate pleurosternids more advanced baenids. Our expanded phylogenetic analysis confirms traditional placement dardeni, Lakotemys australodakotensis, as baenids, retrieves Helochelydridae along stem Baenoidea, but recovers Dinochelys whitei, Glyptops ornatus, Dorsetochelys typocardium, Uluops uluops branching Paracryptodira.

Language: Английский

---

New data on the shell anatomy of Selenemys lusitanica, the oldest known pleurosternid turtle in Europe

Journal of Iberian Geology, Journal Year: 2024, Volume and Issue: 50(1), P. 105 - 113

Published: Jan. 23, 2024

Abstract One of the most diverse turtle lineages in Upper Jurassic and Lower Cretaceous record Europe is that stem turtles Pleurosternidae (Paracryptodira), also distributed North America. The oldest European representative this lineage Portuguese Selenemys lusitanica , known from upper Kimmeridgian to lower Tithonian levels (Late Jurassic). information on shell taxon so far very limited, being exclusively restricted provided publication which was defined. New specimens several localities Consolação Sub-basin Lusitanian Basin, both Leiria District Lisbon District, are studied here. They include complete species found far, as well isolated plates allow us improve knowledge about it. Thus, new anatomy provided, but its intraspecific variability.

Language: Английский

---

A well‐preserved cranium from the Judith River Formation (Montana, USA) reveals the inner ear and neuroanatomy of a Campanian baenid turtle

The Anatomical Record, Journal Year: 2023, Volume and Issue: 306(6), P. 1431 - 1451

Published: March 10, 2023

Abstract A cranium belonging to a baenid turtle was recently recovered from the lower half of Judith River Formation, Montana. Badlands Dinosaur Museum (BDM) 004 is well‐preserved partial that includes posterior cranial vault, base, and otic capsules. Based on diagnostic characters, skull can be attributed Plesiobaena antiqua , which has been previously reported Formation. It also shares with palatobaenines projecting processes tubercula basioccipitale prominent condylus occipitalis deep central pit, demonstrating variation within Pl. hypodigm. In phylogenetic analysis, an operational taxonomic unit BDM positioned Baenodda in unresolved polytomy Edowa zuniensis Palatobaeninae, Eubaeninae. Microcomputed tomographic (μCT) scans revealed morphology middle inner ear endocast are largely unknown baenids. Semicircular canals virtually identical those Eubaena cephalica consistent dimensions other taxa, including anterior semicircular robust taller than common crus diverge each at angle approximately 90°. The digital reveals moderately flexed brain rounded cerebral hemispheres minimal separation between metencephalon myelencephalon. Its columella auris (stapes) gracile posterodorsally flared basis columella. arcs across flattens near its terminus. This study adds understanding neuroanatomical expands morphological .

Language: Английский

---

Updated cranial and mandibular description of the Late Cretaceous (Maastrichtian) baenid turtle Saxochelys gilberti based on micro-computed tomography scans and new information on the holotype-shell association

Swiss Journal of Palaeontology, Journal Year: 2024, Volume and Issue: 143(1)

Published: Jan. 23, 2024

Saxochelys gilberti is a baenid turtle from the Late Cretaceous Hell Creek Formation of United States America known cranial, shell, and other postcranial material. Baenid turtles are taxonomically diverse common fossil elements within through Eocene faunas. Detailed anatomical knowledge critical to understanding systematics morphological evolution group. This particularly important as baenids represent an group continental vertebrates that survived mass extinction event associated with Cretaceous/Paleogene boundary. High-resolution micro-computed tomography scanning holotype skull reveals additional details for already well-known gilberti. includes revision some statements original description, but also detailed on internal features braincase description well-preserved axis (cervical vertebra 2). Our new previous work shell postcrania make one best-described, nearly complete turtles, which often only either isolated or cranial A revised phylogenetic analysis confirms position derived (Eubaeninae) more closely related Baena arenosa than Eubaena cephalica. The online version contains supplementary material available at 10.1186/s13358-023-00301-6.

Language: Английский

---

A description of a Denazinemys nodosa specimen (Testudinata, Baenidae) from the Late Cretaceous Kaiparowits Formation of southern Utah

Fossil record, Journal Year: 2023, Volume and Issue: 26(2), P. 151 - 170

Published: July 31, 2023

Denazinemys nodosa is a Late Cretaceous representative of the North American turtle clade Baenidae diagnosed, among others, by shell surface texture consisting raised welts. We provide detailed description partial skeleton from late Campanian Kaiparowits Formation Utah, USA, including bone-by-bone analysis its cranium based on images obtained using micro-computed tomography. A revised phylogenetic confirms placement close to Eubaena cephalica and Boremys spp. within Eubaeninae. Comparison with second skull previously assigned questions referral this taxon. An assortment specimens Early Mexico USA had been referred alone, even though characteristic known occur in other baenids. Our review all available material concludes that currently only New Utah.

Language: Английский

---

Mandibular anatomy of the paracryptodire Glyptops ornatus supports active hunting behavior in a Jurassic turtle

The Anatomical Record, Journal Year: 2023, Volume and Issue: 307(6), P. 2007 - 2017

Published: Sept. 25, 2023

The mandible of turtles is rich in osteological characters that are relevant for systematic purposes. Shape variation additionally reflects upon various feeding strategies and thus informative the palaeoecological interpretation extinct species based on fossils. mandibular anatomy non-baenid paracryptodires has so far been undescribed. Based digital segmentation a computed tomography scan, I herein describe pleurosternid paracryptodire Glyptops ornatus. This taxon slender gracile jaw, with weakly developed muscle attachment sites adductor muscles (i.e., fossa, coronoid process, retroarticular process) strongly reduced triturating ridges. These features typical suction-feeding aquatic hunters, thereby contrasting robust, durophagous-adapted mandibles many baenid or compsemydid paracryptodires. In addition, G. ornatus characterized by presence large splenial dorsal splenial-dentary contact, foramen, strong reduction foramen dentofaciale majus absence posterior intermandibular foramen.

Language: Английский

---

The helochelydrid turtle Helochelydra nopcsai from the Early Cretaceous (late Barremian – early Aptian) fissure fills of Balve, North Rhine-Westphalia, Germany, including a large sample of granicones

Fossil record, Journal Year: 2023, Volume and Issue: 26(1), P. 117 - 133

Published: June 2, 2023

Early Cretaceous (late Barremian – early Aptian) fissure fill deposits near Balve, North Rhine Westphalia, Germany, have yielded a rich continental vertebrate fauna over the course of last two decades. More than 250 fragmentary specimens, including more 150 osteoderms (i.e., granicones), represent late helochelydrid Helochelydra nopcsai , which had previously been reported from UK, France, and Spain. The new material mostly differs that type section by exhibiting reduced to absent entoplastral scute displaying distinct cranial sulci, both are interpreted as intraspecific variation. Although morphological insights limited, reveals visceral cavity extends anteriorly posteriorly bridge, relatively novel feature for an eclectic mix compsemydids, pleurosternids, other helochelydrids. available sample granicones great shape diversity, but morphometric analysis concludes no morphotypes exist.

Language: Английский

---

Peer Review #2 of "Cranial osteology, taxonomic reassessment, and phylogenetic relationships of the Early Cretaceous (Aptian-Albian) turtle Trinitichelys hiatti (Paracryptodira) (v0.2)"

Published: Nov. 2, 2022

We describe the skull of Early Cretaceous (Aptian-Albian) baenid turtle Trinitichelys hiatti using micro-computed tomography to provide new insights into cranial anatomy basal baenids and evolution paracryptodires.We show that validity versus Arundelemys dardeni still holds true, most known for which material is share an intriguing combination features are typical either Pleurosternidae or Baenidae, carotid system intermediate pleurosternids more advanced baenids.Our expanded phylogenetic analysis confirms traditional placement dardeni, Lakotemys australodakotensis, as baenids, retrieves Helochelydridae along stem Baenoidea, but recovers Dinochelys whitei, Glyptops ornatus, Dorsetochelys typocardium, Uluops uluops branching Paracryptodira.

Language: Английский

---

Peer Review #1 of "Cranial osteology, taxonomic reassessment, and phylogenetic relationships of the Early Cretaceous (Aptian-Albian) turtle Trinitichelys hiatti (Paracryptodira) (v0.1)"

Published: Nov. 2, 2022

We describe the skull of Early Cretaceous (Aptian-Albian) baenid turtle Trinitichelys hiatti using micro-computed tomography to provide new insights into cranial anatomy basal baenids and evolution paracryptodires.We show that validity versus Arundelemys dardeni still holds true, most known for which material is share an intriguing combination features are typical either Pleurosternidae or Baenidae, carotid system intermediate pleurosternids more advanced baenids.Our expanded phylogenetic analysis confirms traditional placement dardeni, Lakotemys australodakotensis, as baenids, retrieves Helochelydridae along stem Baenoidea, but recovers Dinochelys whitei, Glyptops ornatus, Dorsetochelys typocardium, Uluops uluops branching Paracryptodira.

Language: Английский

---

Peer Review #3 of "Cranial osteology, taxonomic reassessment, and phylogenetic relationships of the Early Cretaceous (Aptian-Albian) turtle Trinitichelys hiatti (Paracryptodira) (v0.1)"

Published: Nov. 2, 2022

We describe the skull of Early Cretaceous (Aptian-Albian) baenid turtle Trinitichelys hiatti using micro-computed tomography to provide new insights into cranial anatomy basal baenids and evolution paracryptodires.We show that validity versus Arundelemys dardeni still holds true, most known for which material is share an intriguing combination features are typical either Pleurosternidae or Baenidae, carotid system intermediate pleurosternids more advanced baenids.Our expanded phylogenetic analysis confirms traditional placement dardeni, Lakotemys australodakotensis, as baenids, retrieves Helochelydridae along stem Baenoidea, but recovers Dinochelys whitei, Glyptops ornatus, Dorsetochelys typocardium, Uluops uluops branching Paracryptodira.

Language: Английский

---