dcsimg
Intraspecific variation through ontogeny in late Cretaceous ammonites /
Add this to your Mendeley library Report an error

Title

Intraspecific variation through ontogeny in late Cretaceous ammonites /

Title Variants:

Alternative: Intraspecific variation in late Cretaceous ammonites

Related Titles

Series: American Museum novitates, number 3922

By




Genre

Book

Material Type

Published material

Publication info

New York, NY :American Museum of Natural History,[2019]

Subjects

Ammonoidea , Cretaceous , Development , Great Plains , Mollusks, Fossil , Ontogeny , Paleontology , Scaphites whitfieldi , Variation , West (U.S.)

DOI

https://doi.org/10.1206/3922.1

Find in a local library

Title

Intraspecific variation through ontogeny in late Cretaceous ammonites /

Title Variants:

Alternative: Intraspecific variation in late Cretaceous ammonites

Related Titles

Series: American Museum novitates, number 3922

By

Klein, Carina. , author

Landman, Neil H. , author

Genre

Book

Material Type

Published material

Publication info

New York, NY :American Museum of Natural History,[2019]

Notes:

Caption title.

"March 4, 2019."

Local PDF available in high- and low-resolution versions.

This project assesses intraspecific variation through the ontogeny of the ammonite Scaphites whitfieldi Cobban, 1951, from the Upper Cretaceous of the U.S. Western Interior. Our sample consists of 103 dorsoventral cross sections from nine localities that represent two lithofacies (shale and siltstone). We measured four shell parameters (ww/dm, ww/wh, uw/dm, and WER) to describe the ontogenetic changes in shell morphology. We investigated the variation at three growth stages: immediately after hatching (dm = 1 mm), the neanoconch (dm = 4 mm), and the submature stage (defined as at or near the base of the mature hooklike body chamber). In general, the shell becomes more discoidal through ontogeny with a narrower umbilicus and a more compressed whorl section. The results of the univariate analysis indicate that the variation is statistically significantly higher in the neanoconch than in either the hatchling or submature stage. This pattern is also apparent in the multivariate analysis in which the disparity increases markedly from the hatchling to the neanoconch and then decreases again at the submature stage. These results are consistent with the hypothesis that the neanoconch represents a transition in the life history of the animal to a more demersal mode of life followed by a canalization of morphology toward maturity. However, because the neanic transition occurs over a range of sizes, it is possible that some individuals may have already undergone these changes at dm = 4 mm, whereas others may not have, thus inflating the degree of variation. To resolve this issue in the future, it is critical to examine each ontogenetic trajectory individually to pinpoint the exact size at which the morphological changes occur. We also compared the values of ww/dm, ww/wh, uw/dm, and WER of the three growth stages for the sample from siltstone versus the sample from shale. The comparison reveals that the specimens from siltstone occupy lower regions of the morphospace, implying

Subjects

Ammonoidea , Cretaceous , Development , Great Plains , Mollusks, Fossil , Ontogeny , Paleontology , Scaphites whitfieldi , Variation , West (U.S.)

Call Number

QL1 .A436 no.3922 2019

Language

English

Identifiers:

OCLC: 1089134184

DOI

https://doi.org/10.1206/3922.1

Find in a local library

Download MODS

<mods xmlns:xlink="http://www.w3.org/1999/xlink" version="3.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.loc.gov/mods/v3" xsi:schemaLocation="http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-0.xsd">
<titleInfo>
<title>Intraspecific variation through ontogeny in late Cretaceous ammonites /</title>
</titleInfo>
<titleInfo type="alternative">
<title>Intraspecific variation in late Cretaceous ammonites</title>
</titleInfo>
<name type="personal">
<namePart>Klein, Carina.</namePart>
<role> <roleTerm type="text">author</roleTerm>
</role>
<role> <roleTerm type="text">creator</roleTerm>
</role>
</name>
<name type="personal">
<namePart>Landman, Neil H.</namePart>
<role> <roleTerm type="text">author</roleTerm>
</role>
<role> <roleTerm type="text">contributor</roleTerm>
</role>
</name>
<typeOfResource>text</typeOfResource>
<genre authority="marcgt">book</genre>
<originInfo>
<place>
<placeTerm type="text">New York, NY :</placeTerm>
</place>
<publisher>American Museum of Natural History,</publisher>
<dateIssued>[2019]</dateIssued>
<dateIssued encoding="marc" point="start" keyDate="yes">2019</dateIssued>
</originInfo>
<physicalDescription>
<form authority="marcform">print</form>
</physicalDescription><language>
<languageTerm authority="iso639-2b" type="text">English</languageTerm>
</language>
<note>Caption title.</note>
<note>&quot;March 4, 2019.&quot;</note>
<note>Local PDF available in high- and low-resolution versions.</note>
<note>This project assesses intraspecific variation through the ontogeny of the ammonite Scaphites whitfieldi Cobban, 1951, from the Upper Cretaceous of the U.S. Western Interior. Our sample consists of 103 dorsoventral cross sections from nine localities that represent two lithofacies (shale and siltstone). We measured four shell parameters (ww/dm, ww/wh, uw/dm, and WER) to describe the ontogenetic changes in shell morphology. We investigated the variation at three growth stages: immediately after hatching (dm = 1 mm), the neanoconch (dm = 4 mm), and the submature stage (defined as at or near the base of the mature hooklike body chamber). In general, the shell becomes more discoidal through ontogeny with a narrower umbilicus and a more compressed whorl section. The results of the univariate analysis indicate that the variation is statistically significantly higher in the neanoconch than in either the hatchling or submature stage. This pattern is also apparent in the multivariate analysis in which the disparity increases markedly from the hatchling to the neanoconch and then decreases again at the submature stage. These results are consistent with the hypothesis that the neanoconch represents a transition in the life history of the animal to a more demersal mode of life followed by a canalization of morphology toward maturity. However, because the neanic transition occurs over a range of sizes, it is possible that some individuals may have already undergone these changes at dm = 4 mm, whereas others may not have, thus inflating the degree of variation. To resolve this issue in the future, it is critical to examine each ontogenetic trajectory individually to pinpoint the exact size at which the morphological changes occur. We also compared the values of ww/dm, ww/wh, uw/dm, and WER of the three growth stages for the sample from siltstone versus the sample from shale. The comparison reveals that the specimens from siltstone occupy lower regions of the morphospace, implying</note>
<subject>
<topic>Ammonoidea</topic>
</subject>
<subject>
<temporal>Cretaceous</temporal>
</subject>
<subject>
<topic>Development</topic>
</subject>
<subject>
<geographic>Great Plains</geographic>
</subject>
<subject>
<topic>Mollusks, Fossil</topic>
</subject>
<subject>
<topic>Ontogeny</topic>
</subject>
<subject>
<topic>Paleontology</topic>
</subject>
<subject>
<topic>Scaphites whitfieldi</topic>
</subject>
<subject>
<topic>Variation</topic>
</subject>
<subject>
<geographic>West (U.S.)</geographic>
</subject>
<classification authority="lcc">QL1 .A436 no.3922 2019</classification>
<relatedItem type="series">
<titleInfo>
<title>American Museum novitates, number 3922</title>
</titleInfo>
<identifier type="issn">0003-0082</identifier>
</relatedItem>
<identifier type="uri">https://www.biodiversitylibrary.org/bibliography/159038</identifier>
<identifier type="oclc">1089134184</identifier>
<identifier type="doi">10.1206/3922.1</identifier>
<recordInfo>
<recordContentSource authority="marcorg">YAM</recordContentSource>
</recordInfo>
</mods>

Download BibTeX citations

@book{bhl266389,
title = {Intraspecific variation through ontogeny in late Cretaceous ammonites / },
volume = {no. 3922},
copyright = {In copyright. Digitized with the permission of the rights holder.},
url = {https://www.biodiversitylibrary.org/item/266389},
note = {https://www.biodiversitylibrary.org/bibliography/159038 --- Caption title. --- "March 4, 2019." --- Local PDF available in high- and low-resolution versions. --- This project assesses intraspecific variation through the ontogeny of the ammonite Scaphites whitfieldi Cobban, 1951, from the Upper Cretaceous of the U.S. Western Interior. Our sample consists of 103 dorsoventral cross sections from nine localities that represent two lithofacies (shale and siltstone). We measured four shell parameters (ww/dm, ww/wh, uw/dm, and WER) to describe the ontogenetic changes in shell morphology. We investigated the variation at three growth stages: immediately after hatching (dm = 1 mm), the neanoconch (dm = 4 mm), and the submature stage (defined as at or near the base of the mature hooklike body chamber). In general, the shell becomes more discoidal through ontogeny with a narrower umbilicus and a more compressed whorl section. The results of the univariate analysis indicate that the variation is statistically significantly higher in the neanoconch than in either the hatchling or submature stage. This pattern is also apparent in the multivariate analysis in which the disparity increases markedly from the hatchling to the neanoconch and then decreases again at the submature stage. These results are consistent with the hypothesis that the neanoconch represents a transition in the life history of the animal to a more demersal mode of life followed by a canalization of morphology toward maturity. However, because the neanic transition occurs over a range of sizes, it is possible that some individuals may have already undergone these changes at dm = 4 mm, whereas others may not have, thus inflating the degree of variation. To resolve this issue in the future, it is critical to examine each ontogenetic trajectory individually to pinpoint the exact size at which the morphological changes occur. We also compared the values of ww/dm, ww/wh, uw/dm, and WER of the three growth stages for the sample from siltstone versus the sample from shale. The comparison reveals that the specimens from siltstone occupy lower regions of the morphospace, implying},
publisher = {New York, NY :American Museum of Natural History,},
author = {Klein, Carina. and Landman, Neil H.},
year = {2019},
pages = {28},
keywords = {Ammonoidea|Cretaceous|Development|Great Plains|Mollusks, Fossil|Ontogeny|Paleontology|Scaphites whitfieldi|Variation|West (U.S.)|},
}

Download RIS citations

TY - BOOK
TI - Intraspecific variation through ontogeny in late Cretaceous ammonites /
VL - no. 3922
UR - https://www.biodiversitylibrary.org/item/266389
PB - American Museum of Natural History,
CY - New York, NY :
PY - 2019
N1 - Caption title. --- "March 4, 2019." --- Local PDF available in high- and low-resolution versions. --- This project assesses intraspecific variation through the ontogeny of the ammonite Scaphites whitfieldi Cobban, 1951, from the Upper Cretaceous of the U.S. Western Interior. Our sample consists of 103 dorsoventral cross sections from nine localities that represent two lithofacies (shale and siltstone). We measured four shell parameters (ww/dm, ww/wh, uw/dm, and WER) to describe the ontogenetic changes in shell morphology. We investigated the variation at three growth stages: immediately after hatching (dm = 1 mm), the neanoconch (dm = 4 mm), and the submature stage (defined as at or near the base of the mature hooklike body chamber). In general, the shell becomes more discoidal through ontogeny with a narrower umbilicus and a more compressed whorl section. The results of the univariate analysis indicate that the variation is statistically significantly higher in the neanoconch than in either the hatchling or submature stage. This pattern is also apparent in the multivariate analysis in which the disparity increases markedly from the hatchling to the neanoconch and then decreases again at the submature stage. These results are consistent with the hypothesis that the neanoconch represents a transition in the life history of the animal to a more demersal mode of life followed by a canalization of morphology toward maturity. However, because the neanic transition occurs over a range of sizes, it is possible that some individuals may have already undergone these changes at dm = 4 mm, whereas others may not have, thus inflating the degree of variation. To resolve this issue in the future, it is critical to examine each ontogenetic trajectory individually to pinpoint the exact size at which the morphological changes occur. We also compared the values of ww/dm, ww/wh, uw/dm, and WER of the three growth stages for the sample from siltstone versus the sample from shale. The comparison reveals that the specimens from siltstone occupy lower regions of the morphospace, implying
AU - Klein, Carina.
AU - Landman, Neil H.
KW - Ammonoidea
KW - Cretaceous
KW - Development
KW - Great Plains
KW - Mollusks, Fossil
KW - Ontogeny
KW - Paleontology
KW - Scaphites whitfieldi
KW - Variation
KW - West (U.S.)
ER -