Typosyllis tyrrhena (Polychaeta, Syllidae, Syllinae), a new species from the island Elba, Tyrrhenian Sea

Abstract

A new Typosyllis species, T. tyrrhena (Polychaeta, Syllidae, Syllinae), from subtidal sediments off the island Elba, Tyrrhenian Sea is illustrated and described through light-microscopical and SEM investigations. T. tyrrhena sp. nov. is distinguished from other Typosyllis species by possession of (i) only a very few compound falcigerous chaetae, (ii) dorsal cirri of chaetiger 1 that are not longer and no more numerously articulated than the dorsal cirri of the following chaetigers, and (iii) a very short proventricle with only a few muscular rings.