Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus

Abstract Assessing the taxonomic importance of the suture line in shelled cephalopods is a key to better understanding the diversity of this group in Earth history. Because fossils are subject to taphonomic artifacts, an in-depth knowledge of well-preserved modern organisms is needed as an important...

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Autores principales:	Amane Tajika, Naoki Morimoto, Neil H. Landman
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1f4db5212e494a419e2229b288eac9a1
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spelling	oai:doaj.org-article:1f4db5212e494a419e2229b288eac9a12021-12-02T18:53:14ZSignificance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus10.1038/s41598-021-96611-12045-2322https://doaj.org/article/1f4db5212e494a419e2229b288eac9a12021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96611-1https://doaj.org/toc/2045-2322Abstract Assessing the taxonomic importance of the suture line in shelled cephalopods is a key to better understanding the diversity of this group in Earth history. Because fossils are subject to taphonomic artifacts, an in-depth knowledge of well-preserved modern organisms is needed as an important reference. Here, we examine the suture line morphology of all known species of the modern cephalopods Nautilus and Allonautilus. We applied computed tomography and geometric morphometrics to quantify the suture line morphology as well as the conch geometry and septal spacing. Results reveal that the suture line and conch geometry are useful in distinguishing species, while septal spacing is less useful. We also constructed cluster trees to illustrate the similarity among species. The tree based on conch geometry in middle ontogeny is nearly congruent with those previously reconstructed based on molecular data. In addition, different geographical populations of the same species of Nautilus separate out in this tree. This suggests that genetically distinct (i.e., geographically isolated) populations of Nautilus can also be distinguished using conch geometry. Our results are applicable to closely related fossil cephalopods (nautilids), but may not apply to more distantly related forms (ammonoids).Amane TajikaNaoki MorimotoNeil H. LandmanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Amane Tajika Naoki Morimoto Neil H. Landman Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus
description	Abstract Assessing the taxonomic importance of the suture line in shelled cephalopods is a key to better understanding the diversity of this group in Earth history. Because fossils are subject to taphonomic artifacts, an in-depth knowledge of well-preserved modern organisms is needed as an important reference. Here, we examine the suture line morphology of all known species of the modern cephalopods Nautilus and Allonautilus. We applied computed tomography and geometric morphometrics to quantify the suture line morphology as well as the conch geometry and septal spacing. Results reveal that the suture line and conch geometry are useful in distinguishing species, while septal spacing is less useful. We also constructed cluster trees to illustrate the similarity among species. The tree based on conch geometry in middle ontogeny is nearly congruent with those previously reconstructed based on molecular data. In addition, different geographical populations of the same species of Nautilus separate out in this tree. This suggests that genetically distinct (i.e., geographically isolated) populations of Nautilus can also be distinguished using conch geometry. Our results are applicable to closely related fossil cephalopods (nautilids), but may not apply to more distantly related forms (ammonoids).
format	article
author	Amane Tajika Naoki Morimoto Neil H. Landman
author_facet	Amane Tajika Naoki Morimoto Neil H. Landman
author_sort	Amane Tajika
title	Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus
title_short	Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus
title_full	Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus
title_fullStr	Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus
title_full_unstemmed	Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus
title_sort	significance of the suture line in cephalopod taxonomy revealed by 3d morphometrics in the modern nautilids nautilus and allonautilus
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1f4db5212e494a419e2229b288eac9a1
work_keys_str_mv	AT amanetajika significanceofthesuturelineincephalopodtaxonomyrevealedby3dmorphometricsinthemodernnautilidsnautilusandallonautilus AT naokimorimoto significanceofthesuturelineincephalopodtaxonomyrevealedby3dmorphometricsinthemodernnautilidsnautilusandallonautilus AT neilhlandman significanceofthesuturelineincephalopodtaxonomyrevealedby3dmorphometricsinthemodernnautilidsnautilusandallonautilus
_version_	1718377314571517952

Significance of the suture line in cephalopod taxonomy revealed by 3D morphometrics in the modern nautilids Nautilus and Allonautilus

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