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Morphology of the braincase in the Cretaceous hybodont shark Tribodus limae (Chondrichthyes, Elasmobranchii), based on CT scanning
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Title

Morphology of the braincase in the Cretaceous hybodont shark Tribodus limae (Chondrichthyes, Elasmobranchii), based on CT scanning

Title Variants:

Alternative: Braincase in the shark Tribodus limae

Related Titles

Series: American Museum novitates, no. 3681

By


Type

Book

Material

Published material

Publication info

New York, NY :American Museum of Natural History,c2010.

Subjects

Anatomy , Araripe Plateau , Brazil , Ceará (State) , Chondrichthyes , Cretaceous , Egertonodus basanus , Fishes, Fossil , Neuroanatomy , Paleontology , Phylogeny , Sharks , Sharks, Fossil , Skull , Tomography , Tribodus limae

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Title

Morphology of the braincase in the Cretaceous hybodont shark Tribodus limae (Chondrichthyes, Elasmobranchii), based on CT scanning

Title Variants:

Alternative: Braincase in the shark Tribodus limae

Related Titles

Series: American Museum novitates, no. 3681

By

Lane, Jennifer A.

Type

Book

Material

Published material

Publication info

New York, NY :American Museum of Natural History,c2010.

Notes:

Caption title.

"March 4, 2010."

The braincase of the Lower Cretaceous hybodont shark Tribodus limae is examined using high-resolution CT scanning, and its internal and external morphology is described based on three-dimensional digital reconstructions. This study represents the first in-depth examination of a hybodont braincase using CT scanning and digital imaging technology. The braincase of an additional Lower Cretaceous hybodont, Egertonodus basanus, is also digitally reconstructed and compared to Tribodus. A reconstruction of cranial nerves and blood vessels in Tribodus is presented on the basis of preserved foramina. The braincase of Tribodus shares many features with those of Egertonodus and neoselachians, providing further support for the sister-group relationship between hybodonts and extant elasmobranchs. CT scans confirm that in both Tribodus and Egertonodus the glossopharyngeal and vagus canals converge and exit from a common foramen (also found in Chlamydoselachus). In both of the hybodonts examined, the trochlear nerve exits the braincase anterior to the optic nerve, a possible hybodont synapomorphy. Separate foramina for the two rami of the octaval nerve are present in both Tribodus and Egertonodus, and may represent an additional hybodont synapomorphy. Also, both taxa have three separate foramina for the trigeminal, facial, and anterodorsal lateral line nerves, apparently including an individual foramen for the superficial ophthalmic complex. However, the basicranial arterial system in Tribodus differs considerably from that of Egertonodus in that in the former the internal carotid arteries enter the braincase much farther posteriorly and through paired foramina rather than a single median foramen. The median ventral basicranial process in Tribodus is similar in structure and position to median ventral processes seen in some extant neoselachians (e.g., Etmopterus) and in embryonic Torpedo (although in the latter this structure disappears during development), and thus may have had a similar ontogenetic origin.

Subjects

Anatomy , Araripe Plateau , Brazil , Ceará (State) , Chondrichthyes , Cretaceous , Egertonodus basanus , Fishes, Fossil , Neuroanatomy , Paleontology , Phylogeny , Sharks , Sharks, Fossil , Skull , Tomography , Tribodus limae

Call Number

QL1 .A436 no.3681 2010

Language

English

Identifiers:

OCLC: 549097839

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Download MODS

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<note>The braincase of the Lower Cretaceous hybodont shark Tribodus limae is examined using high-resolution CT scanning, and its internal and external morphology is described based on three-dimensional digital reconstructions. This study represents the first in-depth examination of a hybodont braincase using CT scanning and digital imaging technology. The braincase of an additional Lower Cretaceous hybodont, Egertonodus basanus, is also digitally reconstructed and compared to Tribodus. A reconstruction of cranial nerves and blood vessels in Tribodus is presented on the basis of preserved foramina. The braincase of Tribodus shares many features with those of Egertonodus and neoselachians, providing further support for the sister-group relationship between hybodonts and extant elasmobranchs. CT scans confirm that in both Tribodus and Egertonodus the glossopharyngeal and vagus canals converge and exit from a common foramen (also found in Chlamydoselachus). In both of the hybodonts examined, the trochlear nerve exits the braincase anterior to the optic nerve, a possible hybodont synapomorphy. Separate foramina for the two rami of the octaval nerve are present in both Tribodus and Egertonodus, and may represent an additional hybodont synapomorphy. Also, both taxa have three separate foramina for the trigeminal, facial, and anterodorsal lateral line nerves, apparently including an individual foramen for the superficial ophthalmic complex. However, the basicranial arterial system in Tribodus differs considerably from that of Egertonodus in that in the former the internal carotid arteries enter the braincase much farther posteriorly and through paired foramina rather than a single median foramen. The median ventral basicranial process in Tribodus is similar in structure and position to median ventral processes seen in some extant neoselachians (e.g., Etmopterus) and in embryonic Torpedo (although in the latter this structure disappears during development), and thus may have had a similar ontogenetic origin.</note>
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Download BibTeX citations

@book{bhl279452,
title = {Morphology of the braincase in the Cretaceous hybodont shark Tribodus limae (Chondrichthyes, Elasmobranchii), based on CT scanning },
volume = {no. 3681},
copyright = {In copyright. Digitized with the permission of the rights holder.},
url = {https://www.biodiversitylibrary.org/item/279452},
note = {https://www.biodiversitylibrary.org/bibliography/168214 --- Caption title. --- "March 4, 2010." --- The braincase of the Lower Cretaceous hybodont shark Tribodus limae is examined using high-resolution CT scanning, and its internal and external morphology is described based on three-dimensional digital reconstructions. This study represents the first in-depth examination of a hybodont braincase using CT scanning and digital imaging technology. The braincase of an additional Lower Cretaceous hybodont, Egertonodus basanus, is also digitally reconstructed and compared to Tribodus. A reconstruction of cranial nerves and blood vessels in Tribodus is presented on the basis of preserved foramina. The braincase of Tribodus shares many features with those of Egertonodus and neoselachians, providing further support for the sister-group relationship between hybodonts and extant elasmobranchs. CT scans confirm that in both Tribodus and Egertonodus the glossopharyngeal and vagus canals converge and exit from a common foramen (also found in Chlamydoselachus). In both of the hybodonts examined, the trochlear nerve exits the braincase anterior to the optic nerve, a possible hybodont synapomorphy. Separate foramina for the two rami of the octaval nerve are present in both Tribodus and Egertonodus, and may represent an additional hybodont synapomorphy. Also, both taxa have three separate foramina for the trigeminal, facial, and anterodorsal lateral line nerves, apparently including an individual foramen for the superficial ophthalmic complex. However, the basicranial arterial system in Tribodus differs considerably from that of Egertonodus in that in the former the internal carotid arteries enter the braincase much farther posteriorly and through paired foramina rather than a single median foramen. The median ventral basicranial process in Tribodus is similar in structure and position to median ventral processes seen in some extant neoselachians (e.g., Etmopterus) and in embryonic Torpedo (although in the latter this structure disappears during development), and thus may have had a similar ontogenetic origin.},
publisher = {New York, NY :American Museum of Natural History,},
author = {Lane, Jennifer A.},
year = {2010},
pages = {6},
keywords = {Anatomy|Araripe Plateau|Brazil|Ceará (State)|Chondrichthyes|Cretaceous|Egertonodus basanus|Fishes, Fossil|Neuroanatomy|Paleontology|Phylogeny|Sharks|Sharks, Fossil|Skull|Tomography|Tribodus limae},
}

Download RIS citations

TY - BOOK
TI - Morphology of the braincase in the Cretaceous hybodont shark Tribodus limae (Chondrichthyes, Elasmobranchii), based on CT scanning
VL - no. 3681
UR - https://www.biodiversitylibrary.org/item/279452
PB - American Museum of Natural History,
CY - New York, NY :
PY - 2010
N1 - Caption title. --- "March 4, 2010." --- The braincase of the Lower Cretaceous hybodont shark Tribodus limae is examined using high-resolution CT scanning, and its internal and external morphology is described based on three-dimensional digital reconstructions. This study represents the first in-depth examination of a hybodont braincase using CT scanning and digital imaging technology. The braincase of an additional Lower Cretaceous hybodont, Egertonodus basanus, is also digitally reconstructed and compared to Tribodus. A reconstruction of cranial nerves and blood vessels in Tribodus is presented on the basis of preserved foramina. The braincase of Tribodus shares many features with those of Egertonodus and neoselachians, providing further support for the sister-group relationship between hybodonts and extant elasmobranchs. CT scans confirm that in both Tribodus and Egertonodus the glossopharyngeal and vagus canals converge and exit from a common foramen (also found in Chlamydoselachus). In both of the hybodonts examined, the trochlear nerve exits the braincase anterior to the optic nerve, a possible hybodont synapomorphy. Separate foramina for the two rami of the octaval nerve are present in both Tribodus and Egertonodus, and may represent an additional hybodont synapomorphy. Also, both taxa have three separate foramina for the trigeminal, facial, and anterodorsal lateral line nerves, apparently including an individual foramen for the superficial ophthalmic complex. However, the basicranial arterial system in Tribodus differs considerably from that of Egertonodus in that in the former the internal carotid arteries enter the braincase much farther posteriorly and through paired foramina rather than a single median foramen. The median ventral basicranial process in Tribodus is similar in structure and position to median ventral processes seen in some extant neoselachians (e.g., Etmopterus) and in embryonic Torpedo (although in the latter this structure disappears during development), and thus may have had a similar ontogenetic origin.
AU - Lane, Jennifer A.
KW - Anatomy
KW - Araripe Plateau
KW - Brazil
KW - Ceará (State)
KW - Chondrichthyes
KW - Cretaceous
KW - Egertonodus basanus
KW - Fishes, Fossil
KW - Neuroanatomy
KW - Paleontology
KW - Phylogeny
KW - Sharks
KW - Sharks, Fossil
KW - Skull
KW - Tomography
KW - Tribodus limae
ER -