Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia
Phylogenetic relationships within the helcionelloids have been difficult to establish. One of the reasons for this is that qualitative approaches to investigating morphological variation in this group have struggled to identify clear patterns. An alternative method of identifying these patterns is t...
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Data Archiving and Networked Services (DANS)
2019
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Online Access: | https://doi.org/10.5061/dryad.5b7n3 |
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fttriple:oai:gotriple.eu:50|dedup_wf_001::93400d7fbf6f5906ce8cfee8f84317fe 2023-05-15T13:59:13+02:00 Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia Jackson, Illiam S.C. Claybourn, Thomas M. 2019-01-01 https://doi.org/10.5061/dryad.5b7n3 undefined unknown Data Archiving and Networked Services (DANS) http://dx.doi.org/10.5061/dryad.5b7n3 https://dx.doi.org/10.5061/dryad.5b7n3 lic_creative-commons oai:easy.dans.knaw.nl:easy-dataset:99893 10.5061/dryad.5b7n3 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:99893 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 Life sciences medicine and health care Helcionelloida species concept incipient species Elliptical Fourier Analysis Early Cambrian Davidonia Cambrian Series 2 geo archeo Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2019 fttriple https://doi.org/10.5061/dryad.5b7n3 2023-01-22T17:23:13Z Phylogenetic relationships within the helcionelloids have been difficult to establish. One of the reasons for this is that qualitative approaches to investigating morphological variation in this group have struggled to identify clear patterns. An alternative method of identifying these patterns is to study these organisms quantitatively. Here this approach is exemplified by employing morphometric methods to investigate patterns of subtle morphological variation in two species of Mackinnonia Runnegar in Bengtson et al from Cambrian Series 2, Stages 3–4. Specifically, a combination of elliptical Fourier and multivariate analyses were conducted to study intra- and interspecific variation in protoconch form as well as variation in ontogenetic trajectory of the teleoconch of two species of Mackinnonia. The material used consists of two assemblages of Mackinnonia rostrata (Zhou & Xiao), from the Shackleton Limestone of Antarctica and Ajax Limestone of Australia, and an assemblage of Mackinnonia taconica (Landing & Bartowski) from the Bastion Formation of Greenland. Results of this study show significant (p<0.0001) differences in protoconch shape between all three groups. Ontogenetic sequences of outline curves truncated at successive rugae significantly (p<0.05) discriminate between M. rostrata and M. taconica. These techniques uncovered significant intraspecific morphological variation of disparate assemblages of M. rostrata despite shared qualitative features and structure a conceptual framework for understanding such patterns of variation and put this in the context of the incipient species concept. Ontogeny dataset.jmp file (type used in analysis in JMP software) including EFA residuals and PCA results for all data including for each rib and protoconchs of all data.Ontogeny dataset.csv file including EFA residuals and PCA results for all data including for each rib and protoconchs of all data.Protoconch dataset.jmp file (type used in analysis in JMP software) including EFA residuals and PCA results ... Dataset Antarc* Antarctica Greenland Unknown Shackleton Greenland Ajax ENVELOPE(168.450,168.450,-71.800,-71.800) The Bastion ENVELOPE(-136.705,-136.705,67.655,67.655) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
unknown |
topic |
Life sciences medicine and health care Helcionelloida species concept incipient species Elliptical Fourier Analysis Early Cambrian Davidonia Cambrian Series 2 geo archeo |
spellingShingle |
Life sciences medicine and health care Helcionelloida species concept incipient species Elliptical Fourier Analysis Early Cambrian Davidonia Cambrian Series 2 geo archeo Jackson, Illiam S.C. Claybourn, Thomas M. Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia |
topic_facet |
Life sciences medicine and health care Helcionelloida species concept incipient species Elliptical Fourier Analysis Early Cambrian Davidonia Cambrian Series 2 geo archeo |
description |
Phylogenetic relationships within the helcionelloids have been difficult to establish. One of the reasons for this is that qualitative approaches to investigating morphological variation in this group have struggled to identify clear patterns. An alternative method of identifying these patterns is to study these organisms quantitatively. Here this approach is exemplified by employing morphometric methods to investigate patterns of subtle morphological variation in two species of Mackinnonia Runnegar in Bengtson et al from Cambrian Series 2, Stages 3–4. Specifically, a combination of elliptical Fourier and multivariate analyses were conducted to study intra- and interspecific variation in protoconch form as well as variation in ontogenetic trajectory of the teleoconch of two species of Mackinnonia. The material used consists of two assemblages of Mackinnonia rostrata (Zhou & Xiao), from the Shackleton Limestone of Antarctica and Ajax Limestone of Australia, and an assemblage of Mackinnonia taconica (Landing & Bartowski) from the Bastion Formation of Greenland. Results of this study show significant (p<0.0001) differences in protoconch shape between all three groups. Ontogenetic sequences of outline curves truncated at successive rugae significantly (p<0.05) discriminate between M. rostrata and M. taconica. These techniques uncovered significant intraspecific morphological variation of disparate assemblages of M. rostrata despite shared qualitative features and structure a conceptual framework for understanding such patterns of variation and put this in the context of the incipient species concept. Ontogeny dataset.jmp file (type used in analysis in JMP software) including EFA residuals and PCA results for all data including for each rib and protoconchs of all data.Ontogeny dataset.csv file including EFA residuals and PCA results for all data including for each rib and protoconchs of all data.Protoconch dataset.jmp file (type used in analysis in JMP software) including EFA residuals and PCA results ... |
format |
Dataset |
author |
Jackson, Illiam S.C. Claybourn, Thomas M. |
author_facet |
Jackson, Illiam S.C. Claybourn, Thomas M. |
author_sort |
Jackson, Illiam S.C. |
title |
Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia |
title_short |
Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia |
title_full |
Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia |
title_fullStr |
Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia |
title_full_unstemmed |
Data from: Morphometric analysis of inter- and intraspecific variation in the Cambrian helcionelloid mollusc Mackinnonia |
title_sort |
data from: morphometric analysis of inter- and intraspecific variation in the cambrian helcionelloid mollusc mackinnonia |
publisher |
Data Archiving and Networked Services (DANS) |
publishDate |
2019 |
url |
https://doi.org/10.5061/dryad.5b7n3 |
long_lat |
ENVELOPE(168.450,168.450,-71.800,-71.800) ENVELOPE(-136.705,-136.705,67.655,67.655) |
geographic |
Shackleton Greenland Ajax The Bastion |
geographic_facet |
Shackleton Greenland Ajax The Bastion |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
oai:easy.dans.knaw.nl:easy-dataset:99893 10.5061/dryad.5b7n3 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:99893 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 |
op_relation |
http://dx.doi.org/10.5061/dryad.5b7n3 https://dx.doi.org/10.5061/dryad.5b7n3 |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.5061/dryad.5b7n3 |
_version_ |
1766267725920862208 |