Skip to Main content Skip to Navigation
Journal articles

Parasitic gastropod bioerosion trace fossil on Cenomanian oysters from Le Mans, France and its ichnologic and taphonomic context

Abstract : We describe and name Loxolenichnus stellatocinctus Breton and Wisshak igen. et isp. nov., a bioerosion trace fossil on an Upper Cenomanian oyster from Le Mans (France). This trace is attributed here to a parasitic gastropod. The characteristics of this ichnospecies are a combination of one or several, vertical or oblique, complete penetrations, and an asymmetrical attachment etching (fixichnion) with a diagnostic set of stellate grooves increasingly distinct towards the margin of the trace. By including two former Oichnus ichnospecies, Loxolenichnus halo comb. nov. and Loxolenichnus taddei comb. nov., Oichnus, is now constrained to pure predation traces (praedichnia). The numerous oysters collected from the Marnes à Pycnodonte biauriculata Formation show associated epibionts and encrusters as well as borers and scrapers. Encrusters comprise 24 taxa while bioerosion trace fossils comprise 17 ichnotaxa ranging from very rare (< 0.1%) to quite abundant (81%). The taphonomic history leading to an ex-situ condensation of these oysters is complex. Both the Gnathichnus and Entobia ichnofacies are represented on the shellgrounds, presumably alternatingly.
Document type :
Journal articles
Complete list of metadatas

Cited literature [60 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01471924
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, March 31, 2017 - 8:25:22 AM
Last modification on : Wednesday, April 8, 2020 - 1:32:27 AM
Long-term archiving on: : Saturday, July 1, 2017 - 12:28:01 PM

File

Bretan-ActaPalPol-2017.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Gérard Breton, Max Wisshak, Didier Néraudeau, Nicolas Morel. Parasitic gastropod bioerosion trace fossil on Cenomanian oysters from Le Mans, France and its ichnologic and taphonomic context. Acta Palaeontologica Polonica, Polskiej Akademii Nauk, Instytut Paleobiologii, 2017, 62 (1), pp.45-57. ⟨10.4202/app.00304.2016⟩. ⟨insu-01471924⟩

Share

Metrics

Record views

379

Files downloads

683