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Shape Variation and Disparity in Mid...

Mendoza Maya, Ana Karen.

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Shape Variation and Disparity in Middle Cambrian Trilobites From Utah.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shape Variation and Disparity in Middle Cambrian Trilobites From Utah./
作者:	Mendoza Maya, Ana Karen.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
面頁冊數:	39 p.
附註:	Source: Masters Abstracts International, Volume: 85-12.
Contained By:	Masters Abstracts International85-12.
標題:	Paleontology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31295672
ISBN:	9798382868301

Shape Variation and Disparity in Middle Cambrian Trilobites From Utah.
Mendoza Maya, Ana Karen.

Shape Variation and Disparity in Middle Cambrian Trilobites From Utah. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 39 p.

Source: Masters Abstracts International, Volume: 85-12.

Thesis (M.A.)--University of Kansas, 2024.

The Middle Cambrian period, marked by the Cambrian radiation, witnessed a surge in animal diversity, with trilobites being significant contributors to this phenomenon. Employing geometric morphometrics techniques, I investigated the cranidial shape variation in Middle Cambrian trilobite species from Utah, aiming to elucidate how the shape and disparity varies across different species and localities, shortly after the Cambrian Radiation interval in an important bilateral clade. The species studied included Asaphiscus wheleeri Meek, 1873, Bathyuriscus fimbriatus Robison, 1964, Modocia brevispina Robison, 1964, and Modocia laevinucha Robison, 1964. My analyses revealed distinct patterns of morphological variation within and among species, shedding light on their evolutionary dynamics. In A. wheeleri, subtle but statistically discernible morphometric clusters were identified, possibly indicative of intraspecific variation. In addition, geographic variation was observed in B. fimbriatus. There is a difference in the disparity of the two species of Modocia considered, but no statistically significant difference in shape variation was found between them. Furthermore, preservation style, tested in two species of Modocia, did not significantly affect morphometric variability, emphasizing the robustness of geometric morphometrics in trilobite studies. These findings contribute to our understanding of trilobite evolution and underscore the importance of quantifying morphological variation for elucidating evolutionary patterns during critical intervals such as the Cambrian.

ISBN: 9798382868301Subjects--Topical Terms:

518862
Paleontology.
Subjects--Index Terms:

Cambrian radiation

Shape Variation and Disparity in Middle Cambrian Trilobites From Utah.
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520 $a The Middle Cambrian period, marked by the Cambrian radiation, witnessed a surge in animal diversity, with trilobites being significant contributors to this phenomenon. Employing geometric morphometrics techniques, I investigated the cranidial shape variation in Middle Cambrian trilobite species from Utah, aiming to elucidate how the shape and disparity varies across different species and localities, shortly after the Cambrian Radiation interval in an important bilateral clade. The species studied included Asaphiscus wheleeri Meek, 1873, Bathyuriscus fimbriatus Robison, 1964, Modocia brevispina Robison, 1964, and Modocia laevinucha Robison, 1964. My analyses revealed distinct patterns of morphological variation within and among species, shedding light on their evolutionary dynamics. In A. wheeleri, subtle but statistically discernible morphometric clusters were identified, possibly indicative of intraspecific variation. In addition, geographic variation was observed in B. fimbriatus. There is a difference in the disparity of the two species of Modocia considered, but no statistically significant difference in shape variation was found between them. Furthermore, preservation style, tested in two species of Modocia, did not significantly affect morphometric variability, emphasizing the robustness of geometric morphometrics in trilobite studies. These findings contribute to our understanding of trilobite evolution and underscore the importance of quantifying morphological variation for elucidating evolutionary patterns during critical intervals such as the Cambrian.
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650 4 $a Paleontology. $3 518862
650 4 $a Paleoclimate science. $3 3173835
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653 $a Shape variation
653 $a Trilobites
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