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Article: The oldest shipworms (Bivalvia, Pholadoidea, Teredinidae) preserved with soft parts (western France): insights into the fossil record and evolution of Pholadoidea

Palaeontology Cover Image - Volume 61 Part 6
Publication: Palaeontology
Volume: 61
Part: 6
Publication Date: November 2018
Page(s): 905 918
Author(s): Ninon Robin, Marcel Velasquez, Anaïs Boura, Géraldine Garcia, Clément Jauvion, Jean‐Marie Boiteau, Bernard Gomez, Véronique Daviero‐Gomez, and Xavier Valentin
Addition Information

How to Cite

ROBIN, N., VELASQUEZ, M., BOURA, A., GARCIA, G., JAUVION, C., BOITEAU, J., GOMEZ, B., DAVIERO‐GOMEZ, V., VALENTIN, X. 2018. The oldest shipworms (Bivalvia, Pholadoidea, Teredinidae) preserved with soft parts (western France): insights into the fossil record and evolution of Pholadoidea. Palaeontology, 61, 6, 905-918. DOI: /doi/10.1111/pala.12376

Author Information

  • Ninon Robin - Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207 MNHN, Sorbonne Université, CNRS) Muséum national d'Histoire naturelle 57 rue Cuvier 75005 Paris France
  • Marcel Velasquez - Institut de Systématique, Évolution, Biodiversité (ISYEB, UMR7205 CNRS, MNHN, UPMC, EPHE) Muséum national d'Histoire naturelle 57 rue Cuvier 75005 Paris France
  • Anaïs Boura - Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207 MNHN, Sorbonne Université, CNRS) Muséum national d'Histoire naturelle 57 rue Cuvier 75005 Paris France
  • Géraldine Garcia - Laboratoire de Paléontologie, Évolution, Paléoécosystèmes et Paléoprimatologie (PALEVOPRIM, UMR7262 CNRS INEE) Université de Poitiers 6 rue Michel‐Brunet 86073 Poitiers Cedex France
  • Clément Jauvion - Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P, UMR 7207 MNHN, Sorbonne Université, CNRS) Muséum national d'Histoire naturelle 57 rue Cuvier 75005 Paris France
  • Clément Jauvion - Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC, UMR 7590 MNHN, Sorbonne Université, CNRS) Muséum national d'Histoire naturelle 57 rue Cuvier 75005 Paris France
  • Jean‐Marie Boiteau - 81 Avenue Jean Mermoz 86100 Châtellerault France
  • Bernard Gomez - Terre, Planètes, Environnement (TPE, UMR 5276 CNRS, Université Lyon 1) Université Lyon 1 (Claude Bernard) 2 rue Raphaël Dubois F‐69622 Villeurbanne France
  • Véronique Daviero‐Gomez - Terre, Planètes, Environnement (TPE, UMR 5276 CNRS, Université Lyon 1) Université Lyon 1 (Claude Bernard) 2 rue Raphaël Dubois F‐69622 Villeurbanne France
  • Xavier Valentin - Laboratoire de Paléontologie, Évolution, Paléoécosystèmes et Paléoprimatologie (PALEVOPRIM, UMR7262 CNRS INEE) Université de Poitiers 6 rue Michel‐Brunet 86073 Poitiers Cedex France
  • Xavier Valentin - Pa1aios Association 15 rue de l'Aumônerie 86300 Valdivienne France

Publication History

  • Issue published online: 19 October 2018
  • Manuscript Accepted: 07 April 2018
  • Manuscript Received: 10 November 2017

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Abstract

Teredinidae are obligate xylophagous bivalves that colonize drift wood. They display a highly derived anatomy with a reduced shell; most of their body consists of soft tissues. Consequently, fossil teredinids mostly correspond to burrows, shells or small terminal aragonite structures called ‘pallets’. We report, from mid‐Cretaceous logs of the Envigne Valley, France, exceptionally preserved wood‐boring bivalves with silicified soft parts. After characterizing the wood, we report both the molluscs’ anatomy and their distribution inside the wood (using computed tomography). The 3D‐reconstructions reveal rarely preserved soft tissues (mantle, respiratory siphons, visceral pouch) but surprisingly no mineralized pallets. Envigne shipworms display neat dorsal condyles and a vermiform body plan, making them the oldest known Teredinidae. To document the evolutionary or taphonomic origin of this lack of pallet, the mineralization of these bivalves was investigated, and it is concluded that pallets could have dissolved prior to other carbonate components. From a survey of the fossil wood‐boring bivalves and their characters, we provide a time scaled origin of the main pholadoid clades supported in recent phylogenies. Since we found no correlation between the presence of pallets in Pholadoidea and their occurrence in the stratigraphic record, we suggest that their absence during the Mesozoic could be the result of a taphonomic bias related to the ‘calcite vs aragonite seas’ paradigm. The Cenomanian Envigne Valley was an estuarine to intertidal environment in which the Teredinidae appear to have selected their wood habitat on the basis of size but not type.

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