Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria
Halkieria is an Early Cambrian fossil genus with proposed phylogenetic affinities ranging from stem group lophotrochozoan to stem-group aculiferan. Skeletal similarities are often cited as evidence in support of a mollusk interpretation for Halkieria and related Cambrian fossils. The skeletal micros...
Published in: | Acta Geologica Sinica - English Edition |
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Online Access: | https://hdl.handle.net/20.500.11897/208012 https://doi.org/10.1111/1755-6724.12305 |
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ftpekinguniv:oai:localhost:20.500.11897/208012 2023-05-15T16:29:54+02:00 Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria Zhang Xiaochuan Yao Jinxian Yao, JX (reprint author), Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China. Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China. 2014 https://hdl.handle.net/20.500.11897/208012 https://doi.org/10.1111/1755-6724.12305 en eng acta geologica sinica english edition ACTA GEOLOGICA SINICA-ENGLISH EDITION.2014,88,(5),1378-1387. 759799 1000-9515 http://hdl.handle.net/20.500.11897/208012 1755-6724 doi:10.1111/1755-6724.12305 WOS:000344450500009 SCI comparative anatomy SSFs Mollusca polyplacophoran sclerite microstructure Halkieria WIWAXIA-CORRUGATA MATTHEW BURGESS SHALE ARTICULATED HALKIERIIDS MOLLUSCAN PHYLOGENY BRITISH-COLUMBIA NORTH GREENLAND POLYPLACOPHORA EVOLUTION FOSSIL APLACOPHORAN Journal 2014 ftpekinguniv https://doi.org/20.500.11897/208012 https://doi.org/10.1111/1755-6724.12305 2021-08-01T08:31:12Z Halkieria is an Early Cambrian fossil genus with proposed phylogenetic affinities ranging from stem group lophotrochozoan to stem-group aculiferan. Skeletal similarities are often cited as evidence in support of a mollusk interpretation for Halkieria and related Cambrian fossils. The skeletal microstructures of the polyplacophoran mollusk (chiton) Ischnochiton hakodadensis, which bears perinotum elements resembling sclerites of halkieriids and other coeloscleritophoran small shelly fossils (SSFs), were studied to evaluate the interpretations. There are both similarities and differences between chiton skeletal structures and halkieriid sclerites: 1) the head valve of I. hakodadensis and the dorsal shell of Halkieria evangelista share a similar pattern of fine concentric growth lines, but halkieriid dorsal shells lack other polyplacophoran valve characteristics, including V-shaped indentation, radiate ribs; 2) the arrangement of I. hakodadensis perinotum elements in three zones is somewhat similar to the arrangement pattern of halkieriid sclerites; 3) the inner perinotum scales of I. hakodadensis (approximate to 200 m in diameter) have a base and a blade, remarkably similar in morphology to halkieriid palmate sclerites (approximate to 400 m in diameter). However, I. hakodadensis perinotum scales are nearly solid whereas halkieriid sclerites are hollow. These observations add a microstructural dimension to the skeletal comparison between mollusks and halkeriids, and may prove to be useful in resolving the phylogenetic affinity of Halkieria and the Halwaxiidae. Geosciences, Multidisciplinary SCI(E) 0 5 1378-1387 88 Journal/Newspaper Greenland North Greenland Peking University Institutional Repository (PKU IR) Burgess ENVELOPE(76.128,76.128,-69.415,-69.415) Greenland Acta Geologica Sinica - English Edition 88 5 1378 1387 |
institution |
Open Polar |
collection |
Peking University Institutional Repository (PKU IR) |
op_collection_id |
ftpekinguniv |
language |
English |
topic |
comparative anatomy SSFs Mollusca polyplacophoran sclerite microstructure Halkieria WIWAXIA-CORRUGATA MATTHEW BURGESS SHALE ARTICULATED HALKIERIIDS MOLLUSCAN PHYLOGENY BRITISH-COLUMBIA NORTH GREENLAND POLYPLACOPHORA EVOLUTION FOSSIL APLACOPHORAN |
spellingShingle |
comparative anatomy SSFs Mollusca polyplacophoran sclerite microstructure Halkieria WIWAXIA-CORRUGATA MATTHEW BURGESS SHALE ARTICULATED HALKIERIIDS MOLLUSCAN PHYLOGENY BRITISH-COLUMBIA NORTH GREENLAND POLYPLACOPHORA EVOLUTION FOSSIL APLACOPHORAN Zhang Xiaochuan Yao Jinxian Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria |
topic_facet |
comparative anatomy SSFs Mollusca polyplacophoran sclerite microstructure Halkieria WIWAXIA-CORRUGATA MATTHEW BURGESS SHALE ARTICULATED HALKIERIIDS MOLLUSCAN PHYLOGENY BRITISH-COLUMBIA NORTH GREENLAND POLYPLACOPHORA EVOLUTION FOSSIL APLACOPHORAN |
description |
Halkieria is an Early Cambrian fossil genus with proposed phylogenetic affinities ranging from stem group lophotrochozoan to stem-group aculiferan. Skeletal similarities are often cited as evidence in support of a mollusk interpretation for Halkieria and related Cambrian fossils. The skeletal microstructures of the polyplacophoran mollusk (chiton) Ischnochiton hakodadensis, which bears perinotum elements resembling sclerites of halkieriids and other coeloscleritophoran small shelly fossils (SSFs), were studied to evaluate the interpretations. There are both similarities and differences between chiton skeletal structures and halkieriid sclerites: 1) the head valve of I. hakodadensis and the dorsal shell of Halkieria evangelista share a similar pattern of fine concentric growth lines, but halkieriid dorsal shells lack other polyplacophoran valve characteristics, including V-shaped indentation, radiate ribs; 2) the arrangement of I. hakodadensis perinotum elements in three zones is somewhat similar to the arrangement pattern of halkieriid sclerites; 3) the inner perinotum scales of I. hakodadensis (approximate to 200 m in diameter) have a base and a blade, remarkably similar in morphology to halkieriid palmate sclerites (approximate to 400 m in diameter). However, I. hakodadensis perinotum scales are nearly solid whereas halkieriid sclerites are hollow. These observations add a microstructural dimension to the skeletal comparison between mollusks and halkeriids, and may prove to be useful in resolving the phylogenetic affinity of Halkieria and the Halwaxiidae. Geosciences, Multidisciplinary SCI(E) 0 5 1378-1387 88 |
author2 |
Yao, JX (reprint author), Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China. Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China. |
format |
Journal/Newspaper |
author |
Zhang Xiaochuan Yao Jinxian |
author_facet |
Zhang Xiaochuan Yao Jinxian |
author_sort |
Zhang Xiaochuan |
title |
Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria |
title_short |
Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria |
title_full |
Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria |
title_fullStr |
Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria |
title_full_unstemmed |
Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria |
title_sort |
skeletal microstructures of the chiton ischnochiton hakodadensis and a comparison with the cambrian halkieria |
publisher |
acta geologica sinica english edition |
publishDate |
2014 |
url |
https://hdl.handle.net/20.500.11897/208012 https://doi.org/10.1111/1755-6724.12305 |
long_lat |
ENVELOPE(76.128,76.128,-69.415,-69.415) |
geographic |
Burgess Greenland |
geographic_facet |
Burgess Greenland |
genre |
Greenland North Greenland |
genre_facet |
Greenland North Greenland |
op_source |
SCI |
op_relation |
ACTA GEOLOGICA SINICA-ENGLISH EDITION.2014,88,(5),1378-1387. 759799 1000-9515 http://hdl.handle.net/20.500.11897/208012 1755-6724 doi:10.1111/1755-6724.12305 WOS:000344450500009 |
op_doi |
https://doi.org/20.500.11897/208012 https://doi.org/10.1111/1755-6724.12305 |
container_title |
Acta Geologica Sinica - English Edition |
container_volume |
88 |
container_issue |
5 |
container_start_page |
1378 |
op_container_end_page |
1387 |
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1766019607617863680 |