New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown

Abstract Ammonite soft body remains are rarely preserved. One of the biggest enigmas is the morphology of the ammonite brachial crown that has, up till now, never been recovered. Recently, mysterious hook-like structures have been reported in multiple specimens of Scaphitidae, a large family of hete...

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Autores principales:	C. P. A. Smith, N. H. Landman, J. Bardin, I. Kruta
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/133f6be3be7b4c8d9032c17fa7307ec1
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spelling	oai:doaj.org-article:133f6be3be7b4c8d9032c17fa7307ec12021-12-02T15:57:11ZNew evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown10.1038/s41598-021-89998-42045-2322https://doaj.org/article/133f6be3be7b4c8d9032c17fa7307ec12021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89998-4https://doaj.org/toc/2045-2322Abstract Ammonite soft body remains are rarely preserved. One of the biggest enigmas is the morphology of the ammonite brachial crown that has, up till now, never been recovered. Recently, mysterious hook-like structures have been reported in multiple specimens of Scaphitidae, a large family of heteromorph Late Cretaceous ammonites. A previous examination of these structures revealed that they belong to the ammonites. Their nature, however, remained elusive. Here, we exploit tomographic data to study their arrangement in space in order to clarify this matter. After using topological data analyses and comparing their morphology, number, and distribution to other known cephalopod structures, in both extant and extinct taxa, we conclude that these hook-like structures represent part of the brachial crown armature. Therefore, it appears that there are at least three independent evolutionary origins of hooks: in belemnoids, oegospids, and now in ammonites. Finally, we propose for the first time a hypothetical reconstruction of an ammonite brachial crown.C. P. A. SmithN. H. LandmanJ. BardinI. KrutaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q C. P. A. Smith N. H. Landman J. Bardin I. Kruta New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
description	Abstract Ammonite soft body remains are rarely preserved. One of the biggest enigmas is the morphology of the ammonite brachial crown that has, up till now, never been recovered. Recently, mysterious hook-like structures have been reported in multiple specimens of Scaphitidae, a large family of heteromorph Late Cretaceous ammonites. A previous examination of these structures revealed that they belong to the ammonites. Their nature, however, remained elusive. Here, we exploit tomographic data to study their arrangement in space in order to clarify this matter. After using topological data analyses and comparing their morphology, number, and distribution to other known cephalopod structures, in both extant and extinct taxa, we conclude that these hook-like structures represent part of the brachial crown armature. Therefore, it appears that there are at least three independent evolutionary origins of hooks: in belemnoids, oegospids, and now in ammonites. Finally, we propose for the first time a hypothetical reconstruction of an ammonite brachial crown.
format	article
author	C. P. A. Smith N. H. Landman J. Bardin I. Kruta
author_facet	C. P. A. Smith N. H. Landman J. Bardin I. Kruta
author_sort	C. P. A. Smith
title	New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
title_short	New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
title_full	New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
title_fullStr	New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
title_full_unstemmed	New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
title_sort	new evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/133f6be3be7b4c8d9032c17fa7307ec1
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New evidence from exceptionally “well-preserved” specimens sheds light on the structure of the ammonite brachial crown

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