The peculiar case of Myxicola infundibulum (Polychaeta: Sabellidae): echo from a science 200 years old and description of four new taxa.

"Myxicola infundibulum Montagu, 1808 is the most reported species of its genus, showing an unusually wide distribution from the Mediterranean area to Australia, North Europe, and North America, a situation deriving from a wide synonymiz- ing of numerous species with M. infundibulum. Recently, genetic analysis confirmed that the Australian form of this species is an introduced taxon from the Mediterranean area, while the examined North American specimens were genetically and morphologically different. In the present paper we travel through the history of M. infundibulum from the first descriptions, trying to trace both the origin of this taxon and the origin of its wide distribution, through an analysis of the descriptions of all valid and invalid taxa to date. We also examined material present in the collection of one of the authors previously identified as M. infundibulum, comparing Mediterranean material to some from the English Channel, and material from North America. This led to the erection of four taxa new to science from material recently collected along the Italian coasts, and the restoration of Myxicola pacifica Johnson, 1901. Delimitation of taxa is based only on morphology, and we propose new morphological features to be considered; however, a molecular examination is planned in the near future."