Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms
Petalichthyid and “acanthothoracid” placoderms have taken pivotal positions in the debate on placoderm — and, by extension, jawed vertebrate — relationships owing to perceived similarities with certain jawless vertebrates. Neurocranial characters are integral to current hypotheses of early gnathosto...
Published in: | Canadian Journal of Earth Sciences |
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2021
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Online Access: | http://dx.doi.org/10.1139/cjes-2020-0005 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2020-0005 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2020-0005 |
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crcansciencepubl:10.1139/cjes-2020-0005 2023-12-17T10:26:02+01:00 Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms Castiello, Marco Jerve, Anna Burton, Maria Grace Friedman, Matt Brazeau, Martin D. 2021 http://dx.doi.org/10.1139/cjes-2020-0005 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2020-0005 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2020-0005 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 58, issue 1, page 93-104 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2021 crcansciencepubl https://doi.org/10.1139/cjes-2020-0005 2023-11-19T13:38:43Z Petalichthyid and “acanthothoracid” placoderms have taken pivotal positions in the debate on placoderm — and, by extension, jawed vertebrate — relationships owing to perceived similarities with certain jawless vertebrates. Neurocranial characters are integral to current hypotheses of early gnathostome relationships. Here, we describe the three-dimensionally preserved neurocranial anatomy of the petalichthyid placoderm Ellopetalichthys scheii (Kiær, 1915), from the Middle Devonian (early Eifelian) of Ellesmere Island, Canada. Using X-ray computed microtomography, we generated three-dimensional reconstructions of the endocranial surfaces, orbital walls, and cranial endocavity. These reconstructions verify the absence of a crus commune of the skeletal labyrinth and the complex shape of the petalichthyid endolympathic duct. Details of the craniothoracic joint and occipital musculature fossae help resolve the problematic comparative anatomy of the occipital surface of petalichthyids. These new data highlight similarities with arthrodire placoderms, consistent with older hypotheses of a sister-group relationship between petalichthyids and that clade. Article in Journal/Newspaper Arctic Ellesmere Island Canadian Science Publishing (via Crossref) Arctic Ellesmere Island Canada Labyrinth ENVELOPE(160.833,160.833,-77.550,-77.550) Canadian Journal of Earth Sciences 58 1 93 104 |
institution |
Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Castiello, Marco Jerve, Anna Burton, Maria Grace Friedman, Matt Brazeau, Martin D. Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms |
topic_facet |
General Earth and Planetary Sciences |
description |
Petalichthyid and “acanthothoracid” placoderms have taken pivotal positions in the debate on placoderm — and, by extension, jawed vertebrate — relationships owing to perceived similarities with certain jawless vertebrates. Neurocranial characters are integral to current hypotheses of early gnathostome relationships. Here, we describe the three-dimensionally preserved neurocranial anatomy of the petalichthyid placoderm Ellopetalichthys scheii (Kiær, 1915), from the Middle Devonian (early Eifelian) of Ellesmere Island, Canada. Using X-ray computed microtomography, we generated three-dimensional reconstructions of the endocranial surfaces, orbital walls, and cranial endocavity. These reconstructions verify the absence of a crus commune of the skeletal labyrinth and the complex shape of the petalichthyid endolympathic duct. Details of the craniothoracic joint and occipital musculature fossae help resolve the problematic comparative anatomy of the occipital surface of petalichthyids. These new data highlight similarities with arthrodire placoderms, consistent with older hypotheses of a sister-group relationship between petalichthyids and that clade. |
format |
Article in Journal/Newspaper |
author |
Castiello, Marco Jerve, Anna Burton, Maria Grace Friedman, Matt Brazeau, Martin D. |
author_facet |
Castiello, Marco Jerve, Anna Burton, Maria Grace Friedman, Matt Brazeau, Martin D. |
author_sort |
Castiello, Marco |
title |
Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms |
title_short |
Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms |
title_full |
Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms |
title_fullStr |
Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms |
title_full_unstemmed |
Endocranial morphology of the petalichthyid placoderm Ellopetalichthys scheii from the Middle Devonian of Arctic Canada, with remarks on the inner ear and neck joint morphology of placoderms |
title_sort |
endocranial morphology of the petalichthyid placoderm ellopetalichthys scheii from the middle devonian of arctic canada, with remarks on the inner ear and neck joint morphology of placoderms |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1139/cjes-2020-0005 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2020-0005 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2020-0005 |
long_lat |
ENVELOPE(160.833,160.833,-77.550,-77.550) |
geographic |
Arctic Ellesmere Island Canada Labyrinth |
geographic_facet |
Arctic Ellesmere Island Canada Labyrinth |
genre |
Arctic Ellesmere Island |
genre_facet |
Arctic Ellesmere Island |
op_source |
Canadian Journal of Earth Sciences volume 58, issue 1, page 93-104 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2020-0005 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
58 |
container_issue |
1 |
container_start_page |
93 |
op_container_end_page |
104 |
_version_ |
1785577726205231104 |