國立虎尾科技大學 |

Shape Variation and Disparity in Middle Cambrian Trilobites From Utah.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Shape Variation and Disparity in Middle Cambrian Trilobites From Utah./
作者:	Mendoza Maya, Ana Karen.
面頁冊數:	1 online resource (39 pages)
附註:	Source: Masters Abstracts International, Volume: 85-12.
Contained By:	Masters Abstracts International85-12.
標題:	Paleoclimate science. -
電子資源:	click for full text (PQDT)
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. - 1 online resource (39 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798382868301Subjects--Topical Terms:

1185587
Paleoclimate science.
Subjects--Index Terms:

Cambrian radiationIndex Terms--Genre/Form:

554714
Electronic books.

Shape Variation and Disparity in Middle Cambrian Trilobites From Utah.
LDR:02926ntm a22003977 4500 001 1152675
005 20241209114629.5
006 m o d
007 cr mn ---uuuuu
008 250605s2024 xx obm 000 0 eng d
020 $a 9798382868301
035 $a (MiAaPQ)AAI31295672
035 $a AAI31295672
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Mendoza Maya, Ana Karen. $3 1479740
245 1 0 $a Shape Variation and Disparity in Middle Cambrian Trilobites From Utah.
264 0 $c 2024
300 $a 1 online resource (39 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 85-12.
500 $a Advisor: Lieberman, Bruce S.
502 $a Thesis (M.A.)--University of Kansas, 2024.
504 $a Includes bibliographical references
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.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Paleoclimate science. $3 1185587
650 4 $a Paleontology. $3 668656
653 $a Cambrian radiation
653 $a Disparity
653 $a Geometric morphometrics
653 $a Shape variation
653 $a Trilobites
653 $a Utah
655 7 $a Electronic books. $2 local $3 554714
690 $a 0418
690 $a 0653
710 2 $a University of Kansas. $b Ecology & Evolutionary Biology. $3 1182644
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Masters Abstracts International $g 85-12.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31295672 $z click for full text (PQDT)