A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i>
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Wright State University / OhioLINK
2009
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=wright1247181599 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-wright12471815992021-08-03T06:16:58Z A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> Williamson, Lauren Elizabeth Geology Paleontology paleontology eocene echinoid Periarchus lyelli morphometrics The Late Eocene echinoid, <i>Periarchus lyelli</i> (Conrad, 1834), known for its wide geographic range, high abundance, and specific stratigraphic range, is an ideal example of a guide fossil. However, due to its highly variable test morphology, many have questioned if, in fact, this sand dollar is actually two or three distinct species that have been misclassified. A preliminary study on this subject has been performed on specimens from Mississippi, North Carolina and South Carolina (Williamson, 2006), showing significant separation in test shapes. Continuing previous research, this study analyzes the test shapes of <i>P. lyelli</i> over its entire North American geographic distribution. Multivariate statistical techniques combined with substrate and structural analysis support the idea of three species instead of one in the case of <i>P. lyelli</i>. This examination of <i>P. lyelli</i> provides insight to the precise classification of the sand dollar and the difference between interspecies variation and intraspecies variation. 2009-07-28 English text Wright State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=wright1247181599 http://rave.ohiolink.edu/etdc/view?acc_num=wright1247181599 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Geology Paleontology paleontology eocene echinoid Periarchus lyelli morphometrics |
| spellingShingle |
Geology Paleontology paleontology eocene echinoid Periarchus lyelli morphometrics Williamson, Lauren Elizabeth A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> |
| author |
Williamson, Lauren Elizabeth |
| author_facet |
Williamson, Lauren Elizabeth |
| author_sort |
Williamson, Lauren Elizabeth |
| title |
A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> |
| title_short |
A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> |
| title_full |
A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> |
| title_fullStr |
A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> |
| title_full_unstemmed |
A Morphometric Analysis of the Highly Variable Clypeasteroid, <i>Periarchus lyelli</i> |
| title_sort |
morphometric analysis of the highly variable clypeasteroid, <i>periarchus lyelli</i> |
| publisher |
Wright State University / OhioLINK |
| publishDate |
2009 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=wright1247181599 |
| work_keys_str_mv |
AT williamsonlaurenelizabeth amorphometricanalysisofthehighlyvariableclypeasteroidiperiarchuslyellii AT williamsonlaurenelizabeth morphometricanalysisofthehighlyvariableclypeasteroidiperiarchuslyellii |
| _version_ |
1719434020918394880 |