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Article: Proteroctopus ribeti in coleoid evolution

Palaeontology Cover Image - Volume 59 Part 6
Publication: Palaeontology
Volume: 59
Part: 6
Publication Date: November 2016
Page(s): 767 773
Author(s): Isabelle Kruta, Isabelle Rouget, Sylvain Charbonnier, Jérémie Bardin, Vincent Fernandez, Damien Germain, Arnaud Brayard, and Neil Landman
Addition Information

How to Cite

KRUTA, I., ROUGET, I., CHARBONNIER, S., BARDIN, J., FERNANDEZ, V., GERMAIN, D., BRAYARD, A., LANDMAN, N. 2016. Proteroctopus ribeti in coleoid evolution. Palaeontology, 59, 6, 767-773. DOI: 10.1111/pala.12265

Author Information

  • Isabelle Kruta - Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207) Sorbonne Universités – UPMC‐Paris 6 MNHN CNRS UPMC Univ. Paris 6 Paris France (Email: isabelle.kruta@upmc.fr)
  • Isabelle Kruta - Division of Paleontology (Invertebrates) American Museum of Natural History New York NY USA
  • Isabelle Rouget - Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207) Sorbonne Universités – UPMC‐Paris 6 MNHN CNRS UPMC Univ. Paris 6 Paris France (Email: isabelle.rouget@upmc.fr)
  • Sylvain Charbonnier - Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207) Sorbonne Universités – UPMC‐Paris 6 MNHN CNRS UPMC Univ. Paris 6 Paris France (Email: scharbonnier@mnhn.fr)
  • Jérémie Bardin - Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207) Sorbonne Universités – UPMC‐Paris 6 MNHN CNRS UPMC Univ. Paris 6 Paris France (Email: jeremie.bardin@upmc.fr)
  • Vincent Fernandez - European Synchrotron Radiation Facility Grenoble France (Email: vinfernand@gmail.com)
  • Damien Germain - Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207) Sorbonne Universités – UPMC‐Paris 6 MNHN CNRS UPMC Univ. Paris 6 Paris France (Email: germain@mnhn.fr)
  • Arnaud Brayard - Biogéosciences UMR6282 CNRS Univ. Bourgogne Franche‐Comté Dijon France (Email: arnaud.brayard@u-bourgogne.fr)
  • Neil Landman - Division of Paleontology (Invertebrates) American Museum of Natural History New York NY USA (Email: landman@amnh.org)

Publication History

  • Manuscript Accepted: 05 September 2016
  • Manuscript Received: 14 January 2016

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Abstract

Palaeontological data are key elements for inferring ancestral character states and the assembly of character complexes, but cephalopod fossils preserving soft tissues are very rare. The exceptionally well‐preserved, unique specimen of Jurassic Proteroctopus ribeti Fischer & Riou from the Lagerstätte of La‐Voulte‐sur‐Rhône (c. 165 Ma, France) is one of the few fossil octopod related taxa, but is rarely considered in evolutionary studies. In this paper, we used synchrotron microtomography to reappraise its external characters and for the first time, to reveal its internal structures. A unique character association is found with two fins, head fused to the body, eight well‐developed arms with cirri and two rows of oblique suckers, a gladius and absence of an ink sac. The phylogenetic analysis indicates that Proteroctopus is a basal member of the Vampyropoda. However, this result should be interpreted with caution due to the number of unknown character states in the matrix. Contrary to previous assumptions, the phylogenetic position of Proteroctopus, as well as its stratigraphic occurrence, suggest that the arrangement of biserial suckers may be the ancestral condition in Vampyropoda.

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