Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens
Concepts of the family Hyolithidae Nicholson fide Fisher and the genera Hyolithes Eichwald and Orthotheca Novak have been expanded through time to encompass a variety of morphologically dissimilar shells. The Hyolithidae is here considered to include only those hyolithid species which have a rounded...
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Cambridge University Press (CUP)
1988
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Online Access: | http://dx.doi.org/10.1017/s0022336000029851 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000029851 |
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crcambridgeupr:10.1017/s0022336000029851 2024-03-03T08:46:46+00:00 Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens Malinky, John Mark 1988 http://dx.doi.org/10.1017/s0022336000029851 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000029851 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 62, issue 2, page 218-233 ISSN 0022-3360 1937-2337 Paleontology journal-article 1988 crcambridgeupr https://doi.org/10.1017/s0022336000029851 2024-02-08T08:34:14Z Concepts of the family Hyolithidae Nicholson fide Fisher and the genera Hyolithes Eichwald and Orthotheca Novak have been expanded through time to encompass a variety of morphologically dissimilar shells. The Hyolithidae is here considered to include only those hyolithid species which have a rounded (convex) dorsum; slopes on the dorsum are inflated, and the venter may be flat or slightly inflated. Hyolithes encompasses species which possess a low dorsum and a prominent longitudinal sulcus along each edge of the dorsum; the ligula is short and the apertural rim is flared. The emended concept of Orthotheca includes only those species of orthothecid hyoliths which have a subtriangular transverse outline and longitudinal lirae covering the shell on both dorsum and venter. Eighteen species of Hyolithes and one species of Orthotheca from the Appalachian region and Western Interior were reexamined in light of more modern taxonomic concepts and standards of quality for type material. Reexamination of type specimens of H. similis Walcott from the Lower Cambrian of Newfoundland, H. whitei Resser from the Lower Cambrian of Nevada, H. billingsi Walcott from the Lower Cambrian of Nevada, H. gallatinensis Resser from the Upper Cambrian of Wyoming, and H. partitus Resser from the Middle Cambrian of Alabama indicates that none of these species represents Hyolithes. Hyolithes similis is here included under the new genus Similotheca, in the new family Similothecidae. Hyolithes whitei is designated as the type species of the new genus Nevadotheca, to which H. billingsi may also belong. Hyolithes gallatinensis is referred to Burithes Missarzhevsky with question, and H. partitus may represent Joachimilites Marek. The type or types of H. attenuatus Walcott, H. cecrops Walcott, H. comptus Howell, H. cowanensis Resser, H. curticei Resser, H. idahoensis Resser, H. prolixus Resser, H. resseri Howell, H. shaleri Walcott, H. terranovicus Walcott, and H. wanneri Resser and Howell lack shells and/or other taxonomically important features ... Article in Journal/Newspaper Newfoundland Cambridge University Press Alabama Nicholson ENVELOPE(78.236,78.236,-68.612,-68.612) Howell ENVELOPE(-99.050,-99.050,-72.233,-72.233) Walcott ENVELOPE(-63.317,-63.317,-69.083,-69.083) Novak ENVELOPE(161.286,161.286,-77.284,-77.284) Journal of Paleontology 62 2 218 233 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Paleontology |
spellingShingle |
Paleontology Malinky, John Mark Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens |
topic_facet |
Paleontology |
description |
Concepts of the family Hyolithidae Nicholson fide Fisher and the genera Hyolithes Eichwald and Orthotheca Novak have been expanded through time to encompass a variety of morphologically dissimilar shells. The Hyolithidae is here considered to include only those hyolithid species which have a rounded (convex) dorsum; slopes on the dorsum are inflated, and the venter may be flat or slightly inflated. Hyolithes encompasses species which possess a low dorsum and a prominent longitudinal sulcus along each edge of the dorsum; the ligula is short and the apertural rim is flared. The emended concept of Orthotheca includes only those species of orthothecid hyoliths which have a subtriangular transverse outline and longitudinal lirae covering the shell on both dorsum and venter. Eighteen species of Hyolithes and one species of Orthotheca from the Appalachian region and Western Interior were reexamined in light of more modern taxonomic concepts and standards of quality for type material. Reexamination of type specimens of H. similis Walcott from the Lower Cambrian of Newfoundland, H. whitei Resser from the Lower Cambrian of Nevada, H. billingsi Walcott from the Lower Cambrian of Nevada, H. gallatinensis Resser from the Upper Cambrian of Wyoming, and H. partitus Resser from the Middle Cambrian of Alabama indicates that none of these species represents Hyolithes. Hyolithes similis is here included under the new genus Similotheca, in the new family Similothecidae. Hyolithes whitei is designated as the type species of the new genus Nevadotheca, to which H. billingsi may also belong. Hyolithes gallatinensis is referred to Burithes Missarzhevsky with question, and H. partitus may represent Joachimilites Marek. The type or types of H. attenuatus Walcott, H. cecrops Walcott, H. comptus Howell, H. cowanensis Resser, H. curticei Resser, H. idahoensis Resser, H. prolixus Resser, H. resseri Howell, H. shaleri Walcott, H. terranovicus Walcott, and H. wanneri Resser and Howell lack shells and/or other taxonomically important features ... |
format |
Article in Journal/Newspaper |
author |
Malinky, John Mark |
author_facet |
Malinky, John Mark |
author_sort |
Malinky, John Mark |
title |
Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens |
title_short |
Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens |
title_full |
Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens |
title_fullStr |
Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens |
title_full_unstemmed |
Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens |
title_sort |
early paleozoic hyolitha from north america: reexamination of walcott's and resser's type specimens |
publisher |
Cambridge University Press (CUP) |
publishDate |
1988 |
url |
http://dx.doi.org/10.1017/s0022336000029851 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000029851 |
long_lat |
ENVELOPE(78.236,78.236,-68.612,-68.612) ENVELOPE(-99.050,-99.050,-72.233,-72.233) ENVELOPE(-63.317,-63.317,-69.083,-69.083) ENVELOPE(161.286,161.286,-77.284,-77.284) |
geographic |
Alabama Nicholson Howell Walcott Novak |
geographic_facet |
Alabama Nicholson Howell Walcott Novak |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Journal of Paleontology volume 62, issue 2, page 218-233 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022336000029851 |
container_title |
Journal of Paleontology |
container_volume |
62 |
container_issue |
2 |
container_start_page |
218 |
op_container_end_page |
233 |
_version_ |
1792502812362407936 |