Sabellaria reefs as reservoirs of preferential species: The case of Eulalia ornata Saint-Joseph, 1888 (Annelida: Phyllodocidae)

Sabellaria alveolata is a widespread coastal engineer species that builds sandy bioconstructions in coastal marine habitats, which host a rich associated fauna. Some of these associated species are quite common on rocky or sandy substrates, but few taxa are strictly linked to Sabellaria reefs. In this study, we report, for the first time, the phyllodocid worm Eulalia ornata in the Tyrrhenian Sea and highlight its high-fidelity link with S. alveolata bioconstructions. Despite being included in the European Red List of Habitats, little is known about Sabellaria reefs, their associated fauna and their ecological role in the Mediterranean Sea. For these reasons, studies aiming at improving our knowledge of S. alveolata reefs and their associated fauna can be regarded as an important step towards more appropriate management plans for sensitive coastal habitats.