Dr Martin Smith martin.smith@durham.ac.uk
Associate Professor
An Ordovician nectocaridid hints at an endocochleate origin of Cephalopoda
Smith, M.R.
Authors
Abstract
Nectocaridids are soft-bodied Cambrian organisms that have been controversially interpreted as primitive cephalopods, contradicting the long-held belief that these molluscs evolved from a shell-bearing ancestor. Here I document a new nectocaridid from the Whetstone Gulf formation, extending the group’s range into the Late Ordovician. Nectocotis rusmithi n. gen, n. sp. possesses a robust internal element that resembles a non-mineralized phragmocone or gladius. Nectocotis can be accommodated in the cephalopod total group if (1) cephalopods inherited a non-mineralized shell field from the ancestral mollusc; (2) the earliest cephalopods bore internal shells. This evolutionary scenario would overturn the traditional ectocochleate, Nautilus-like reconstruction, and indicate a trend towards increased metabolic efficiency through the course of Cambrian–Ordovician evolution.
Citation
Smith, M. (2020). An Ordovician nectocaridid hints at an endocochleate origin of Cephalopoda. Journal of Paleontology, 94(1), 64-69. https://doi.org/10.1017/jpa.2019.57
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 14, 2019 |
Online Publication Date | Aug 15, 2019 |
Publication Date | Jan 31, 2020 |
Deposit Date | Jun 17, 2019 |
Publicly Available Date | Mar 28, 2024 |
Journal | Journal of Paleontology |
Print ISSN | 0022-3360 |
Electronic ISSN | 1937-2337 |
Publisher | Cambridge University Press |
Peer Reviewed | Peer Reviewed |
Volume | 94 |
Issue | 1 |
Pages | 64-69 |
DOI | https://doi.org/10.1017/jpa.2019.57 |
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Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
This article has been published in a revised form in Journal of Paleontology 10.1017/jpa.2019.57. This version is published under a Creative Commons CC-BY-NC-ND. No commercial re-distribution or re-use allowed. Derivative works cannot be distributed. © 2019 The Paleontological Society.
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