Chondrocranial anatomy of Testudo hermanni (Testudinidae, Testudines) with a comparison to other turtles DOI Creative Commons

Carola Mauel,

Luca Leicht,

Yevhenii Broshko

et al.

Journal of Morphology, Journal Year: 2024, Volume and Issue: 285(7)

Published: July 1, 2024

Using histological cross-sections, the chondrocranium anatomy was reconstructed for two developmental stages of Hermann's tortoise (Testudo hermanni). The morphology differs from chondrocrania most other turtles by a process above ectochoanal cartilage with Pelodiscus sinensis being only known species such structure. anterior and posterior processes tectum synoticum are better developed than in an ascending palatoquadrate is missing, which otherwise case pleurodiran turtles. nasal region gets proportionally larger during development. We interpret enlargement capsules as adaption to increase surface area olfactory epithelium perception volant odors. Elongation trionychids, contrast, unlikely be related olfaction, while it ambiguous Sternotherus odoratus. However, we have conclude that research on still at its beginning more comprehensive detailed descriptions relation parts needed before providing broad-scale ecological phylogenetic interpretations.

Language: Английский

The first neuroanatomical study of a marine pleurodire (the large Paleocene bothremydid Azzabaremys moragjonesi) reveals convergences with other clades of pelagic turtles DOI Creative Commons
Marcos Martín‐Jiménez, Adán Pérez‐García

Fossil record, Journal Year: 2025, Volume and Issue: 28(1), P. 1 - 15

Published: Jan. 3, 2025

Azzabaremys moragjonesi , from the Paleocene of Mali, is a member Nigeremydini. This clade bothremydid pleurodiran turtles that includes large putatively marine forms which inhabited African Trans-Saharian Seaway Maastrichtian to Paleocene. work represents first neuroanatomical reconstruction putative sea pleurodire. Some modifications observed for differ those in other lineages Bothremydidae these structures have been documented, corresponding freshwater instead pelagic forms. In fact, primitive condition Pleurodira adaptation environments, as case with all extant representatives, but also most documented extinct The neuroanatomy shows convergences members Pan-Cryptodira adaptations environments (i.e., Chelonioidea, including Cheloniidae and Dermochelyidae), clades exclusive fossil record several Mesozoic Palaeogene uncertain affiliations: Plesiochelyidae, Sandownidae, Protostegidae). Thus, aspects such position geniculate ganglion into canalis cavernosus, absence an anterior vidian canal piercing pterygoid, possession wide semicircular canals endosseous labyrinth, well possible presence enlarged lacrimal glands, are recognized here convergent developed Cryptodira, affiliations, response environments.

Language: Английский

Citations

0
The first neuroanatomical study of a marine pleurodire (the large Paleocene bothremydid Azzabaremys moragjonesi) reveals convergences with other clades of pelagic turtles DOI Creative Commons
Marcos Martín‐Jiménez, Adán Pérez‐García

Fossil record, Journal Year: 2025, Volume and Issue: 28(1), P. 1 - 15

Published: Jan. 3, 2025

Azzabaremys moragjonesi , from the Paleocene of Mali, is a member Nigeremydini. This clade bothremydid pleurodiran turtles that includes large putatively marine forms which inhabited African Trans-Saharian Seaway Maastrichtian to Paleocene. work represents first neuroanatomical reconstruction putative sea pleurodire. Some modifications observed for differ those in other lineages Bothremydidae these structures have been documented, corresponding freshwater instead pelagic forms. In fact, primitive condition Pleurodira adaptation environments, as case with all extant representatives, but also most documented extinct The neuroanatomy shows convergences members Pan-Cryptodira adaptations environments (i.e., Chelonioidea, including Cheloniidae and Dermochelyidae), clades exclusive fossil record several Mesozoic Palaeogene uncertain affiliations: Plesiochelyidae, Sandownidae, Protostegidae). Thus, aspects such position geniculate ganglion into canalis cavernosus, absence an anterior vidian canal piercing pterygoid, possession wide semicircular canals endosseous labyrinth, well possible presence enlarged lacrimal glands, are recognized here convergent developed Cryptodira, affiliations, response environments.

Language: Английский

Citations

0
Skull osteology, neuroanatomy, and jaw‐related myology of the pig‐nosed turtle Carettochelys insculpta (Cryptodira, Trionychia) DOI Creative Commons
Yann Rollot, Serjoscha Evers, Gabriel S. Ferreira

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 307(9), P. 2966 - 3020

Published: Feb. 29, 2024

Abstract The osteology, neuroanatomy, and musculature are known for most primary clades of turtles (i.e., “families”), but knowledge is still lacking one particular clade, the Carettochelyidae . Carettochelyids represented by only living taxon, pig‐nosed turtle Carettochelys insculpta Here, we use micro‐computed tomography osteological contrast‐enhanced stained specimens to describe cranial circulatory system, jaw jaw‐related myology described in detail first time this including m. zygomaticomandibularis, a muscular unit found trionychians. We also document unique arterial pattern internal carotid artery its subordinate branches provide an extensive list ontogenetic differences. present work provides new insights into craniomandibular anatomy will allow better understanding evolutionary history system trionychians intraspecific variation among turtles.

Language: Английский

Citations

3
New insights into the early morphological evolution of sea turtles by re-investigation of Nichollsemys baieri, a three-dimensionally preserved fossil stem chelonioid from the Campanian of Alberta, Canada DOI Creative Commons

J Menon,

Donald B. Brinkman, Guilherme Hermanson

et al.

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

Published: July 12, 2024

Abstract The early evolution of Pan-Chelonioidea (sea turtles) is poorly understood. This in part due to the rarity undeformed skulls definitive stem chelonioids. In this work, we redescribe holotype Nichollsemys baieri using µCT scans and segmentations skull. fossil best 3D preserved skull any Campanian sea turtle, includes partial “soft tissue” preservation. morphologically similar but clearly distinct from Toxochelys spp., both show a mosaic plesiomorphic derived chelonioid features. internal cranial anatomy documents presence characters that are absent such as loss epipterygoids rod-like shape rostrum basisphenoidale. Among numerous splenial bone, which was unnoticed before. An updated phylogenetic analysis retrieves non-protostegid slightly more crownward position than latiremis . Our phylogeny macrobaenids protostegids pan-chelonioids, find unorthodox results for dermochelyids. Thus, although provides important new insights into morphological turtles, much work remains be done. As completely specimen, included recent landmark-based dataset turtles. Morphospace reveals an intermediate between cryptodires crown Based on these data, also predict still capable neck retraction, constraining trait pan-chelonioids.

Language: Английский

Citations

2
Functional and Character Disparity Are Decoupled in Turtle Mandibles DOI Creative Commons
Jasper Ponstein, Guilherme Hermanson, Maren Jansen

et al.

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(11)

Published: Nov. 1, 2024

Turtles have high shape variation of their mandibles, likely reflecting adaptations to a broad variety food items and ingestion strategies. Here, we compare functional disparity measured by biomechanical proxies character discrete morphological characters. Functional disparities vary between clades ecological groups are thus decoupled. Comparisons with cranial also indicate decoupled patterns within the turtle skull. Exploration mandibular reveals that several configurations or state combinations can lead same feeding type (i.e., convergence) be achieved at low exhaustion (e.g., cryptodires). Dietary specialists show larger than generalists, but phylogenetically widespread generalist ecology leads signals in ecotype. Whereas generally shows phylogenetic signal, correspond dietary specializations, which may occur convergently across different groups. Despite this, individual measurements overlapping ranges ecogroups do not always conform expectations. Jaw opening closing advantages model trade-offs force transmission opening/closing speeds, turtles values try synthesize into "jaw types". Closing mechanical advantage retain levels anterior jaw end compared other pseudosuchians). This possibly explained as an evolutionary adaptation bite forces small head sizes.

Language: Английский

Citations

1
Chondrocranial anatomy of Testudo hermanni (Testudinidae, Testudines) with a comparison to other turtles DOI Creative Commons

Carola Mauel,

Luca Leicht,

Yevhenii Broshko

et al.

Journal of Morphology, Journal Year: 2024, Volume and Issue: 285(7)

Published: July 1, 2024

Using histological cross-sections, the chondrocranium anatomy was reconstructed for two developmental stages of Hermann's tortoise (Testudo hermanni). The morphology differs from chondrocrania most other turtles by a process above ectochoanal cartilage with Pelodiscus sinensis being only known species such structure. anterior and posterior processes tectum synoticum are better developed than in an ascending palatoquadrate is missing, which otherwise case pleurodiran turtles. nasal region gets proportionally larger during development. We interpret enlargement capsules as adaption to increase surface area olfactory epithelium perception volant odors. Elongation trionychids, contrast, unlikely be related olfaction, while it ambiguous Sternotherus odoratus. However, we have conclude that research on still at its beginning more comprehensive detailed descriptions relation parts needed before providing broad-scale ecological phylogenetic interpretations.

Language: Английский

Citations

0