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Covariable changes of septal spacing and conch shape during early ontogeny: a common characteristic between Perisphinctina and Ancyloceratina (Ammonoidea, Cephalopoda)

Published online by Cambridge University Press:  15 March 2024

Yutaro Nishino ,
Keisuke Komazaki ,
Masaki Arai ,
Ai Hattori ,
Yuji Uoya ,
Takahiro Iida  and
Ryoji Wani Open the ORCID record for Ryoji Wani [Opens in a new window]
Yutaro Nishino
Affiliation:
Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan , , ,
Keisuke Komazaki
Affiliation:
Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan , , ,
Masaki Arai
Affiliation:
Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan , , ,
Ai Hattori
Affiliation:
College of Urban Science, Yokohama National University, Yokohama 240-8501, Japan
Yuji Uoya
Affiliation:
College of Engineering Science, Yokohama National University, Yokohama 240-8501, Japan
Takahiro Iida
Affiliation:
Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan , , ,
Ryoji Wani*
Affiliation:
Faculty of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan
*
*Corresponding author
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Abstract

We analyzed the ontogenetic trajectories of conch morphology and septal spacing between successive chambers in Cretaceous ammonoids (suborders Perisphinctina and Ancyloceratina) collected from southern India, Madagascar, and Japan. All examined species, except for the family Collignoniceratidae, exhibited similar characteristics during early ontogeny. The common ontogenetic trajectories of septal spacing show a cycle comprising an increase and a subsequent decrease in septal spacing during early ontogeny. The conch diameters at the end of the cycle were estimated to be 1–4 mm. The conch shape (aperture height and whorl expansion rate) covariably changed at this conch diameter. Such covariable changes are commonly recognized in the suborders Perisphinctina and Ancyloceratina. The similarity in the ontogenetic trajectories of conch morphology implies a closer phylogenetic relationship between these suborders compared to Lytoceratina or Phylloceratina.

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Journal of Paleontology , Volume 98 , Issue 1 , January 2024 , pp. 102 - 114
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Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Paleontological Society

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