Bioerosió en molluscs pleistocens de la plataforma marina catalana [Bioerosion in Pleistocene mollusks from the Catalan marine platform]

This work reviews and updates the knowledge on the macrobioerosion traces that appear in molluscan shells of the Würmian (Upper Pleistocene) of the Catalan coast. The samples come from three large areas at Palamós, Blanes and the Ebre Delta, and have been obtained at depths between 70 and 425 m above the marine platform through the trawls of the fishing boats that work there. The most abundant species are the bivalves Arctica islandica and Chlamys islandica and the gastropods Buccinum undatum and Neptunea contraria. Up to 22 ichnotaxa corresponding to macrobioerosion have been identified, of which 17 have never been reported in these shells. The most common traces are identified as the ichnospecies Entobia ispp., Maeandropolydora sulcans, Umbichnus inopinatus, Camarichnus isp., Centrichnus concentricus and Oichnus ispp., which obey to different ecological behaviors. C. concentricus and C. eccentricus are studied with special detail. Ichnological information contributes to improving and expanding knowledge about benthic biodiversity during the last glacial period of the Mediterranean and about biological interactions in the geological past.