Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity

Ammonoid sutures are geometric patterns formed by the intersection of the septa and the shell wall, and have long been a diagnostic tool for ammonite researchers for such applications as species identification, taxonomic relationships, ontogenetic change, functional and evolutionary morphology, dete...

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Autores principales:	Katherine Marriott, John A. Chamberlain
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ammonite sutures fractal geometry ammonoid paleobiology functional morphology ontogeny Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/bfbc5ff4cab34dc389cc13b756fcec45
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spelling	oai:doaj.org-article:bfbc5ff4cab34dc389cc13b756fcec452021-11-25T17:43:17ZUses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity10.3390/geosciences111104762076-3263https://doaj.org/article/bfbc5ff4cab34dc389cc13b756fcec452021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3263/11/11/476https://doaj.org/toc/2076-3263Ammonoid sutures are geometric patterns formed by the intersection of the septa and the shell wall, and have long been a diagnostic tool for ammonite researchers for such applications as species identification, taxonomic relationships, ontogenetic change, functional and evolutionary morphology, determination of ecological niche, and other aspects of ammonoid paleobiology. Researchers interested in a variety of paleobiological questions related to ammonoids have almost always required access to the entire hemisuture. Without access to specimens in museum or institutional collections, researchers must rely on previously published illustrations and photographs of ammonoid sutures. However, due to the perspective in photographs, distortion of the marginal elements of suture geometry occurs due to shell curvature near the venter and umbilicus when photographed in profile. The revised approach described here, which we refer to as the Lateral Lobe Saddle, or LLS approach, makes use of only the lateral lobe and second saddle S<sub>2</sub> (lateral lobe-second saddle pairs, or LLS) which lie in the central, mid-whorl undistorted sector of a suture line as viewed in lateral, profile shell photos and illustrations. The factors by which fractal dimension of LLS data convert to fractal dimension of the standard hemisuture measurements are largely consistent within genera. The LLS method’s non-requirement of a full hemisuture also facilitates comparisons among sutures within an ontogenetic sequence, or sutures from multiple ammonite taxa where ventral and umbilical sutural elements are hidden by whorl overlap or poor preservation.Katherine MarriottJohn A. ChamberlainMDPI AGarticleammonitesuturesfractal geometryammonoid paleobiologyfunctional morphologyontogenyGeologyQE1-996.5ENGeosciences, Vol 11, Iss 476, p 476 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ammonite sutures fractal geometry ammonoid paleobiology functional morphology ontogeny Geology QE1-996.5
spellingShingle	ammonite sutures fractal geometry ammonoid paleobiology functional morphology ontogeny Geology QE1-996.5 Katherine Marriott John A. Chamberlain Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity
description	Ammonoid sutures are geometric patterns formed by the intersection of the septa and the shell wall, and have long been a diagnostic tool for ammonite researchers for such applications as species identification, taxonomic relationships, ontogenetic change, functional and evolutionary morphology, determination of ecological niche, and other aspects of ammonoid paleobiology. Researchers interested in a variety of paleobiological questions related to ammonoids have almost always required access to the entire hemisuture. Without access to specimens in museum or institutional collections, researchers must rely on previously published illustrations and photographs of ammonoid sutures. However, due to the perspective in photographs, distortion of the marginal elements of suture geometry occurs due to shell curvature near the venter and umbilicus when photographed in profile. The revised approach described here, which we refer to as the Lateral Lobe Saddle, or LLS approach, makes use of only the lateral lobe and second saddle S<sub>2</sub> (lateral lobe-second saddle pairs, or LLS) which lie in the central, mid-whorl undistorted sector of a suture line as viewed in lateral, profile shell photos and illustrations. The factors by which fractal dimension of LLS data convert to fractal dimension of the standard hemisuture measurements are largely consistent within genera. The LLS method’s non-requirement of a full hemisuture also facilitates comparisons among sutures within an ontogenetic sequence, or sutures from multiple ammonite taxa where ventral and umbilical sutural elements are hidden by whorl overlap or poor preservation.
format	article
author	Katherine Marriott John A. Chamberlain
author_facet	Katherine Marriott John A. Chamberlain
author_sort	Katherine Marriott
title	Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity
title_short	Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity
title_full	Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity
title_fullStr	Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity
title_full_unstemmed	Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity
title_sort	uses for incomplete ammonite sutures: lateral lobe and second saddle as markers of sutural complexity
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/bfbc5ff4cab34dc389cc13b756fcec45
work_keys_str_mv	AT katherinemarriott usesforincompleteammonitesutureslaterallobeandsecondsaddleasmarkersofsuturalcomplexity AT johnachamberlain usesforincompleteammonitesutureslaterallobeandsecondsaddleasmarkersofsuturalcomplexity
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Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity

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