Abstract
The spionid polychaete Dipolydora giardi (Mesnil, 1896), originally described as a borer in coralline algae from northern France, was later reported world-wide boring into various shells, sponges and also inhabiting mud tubes on soft bottoms. The reported morphological variability and wide range of habitats suggested that more than one species might be involved. In the present study, D. giardi is redescribed based on some material from northern France sent by F. Mesnil in 1896 to the Zoological Museum, University of Copenhagen, and on new material collected in Italy. The species is characterized by its incised prostomium, caruncle to the end of chaetiger 3, branchiae on the anterior half of the body (usually beginning on chaetiger 10), pygidium with one ventral lobe and two smaller dorsal lobes, and heavy falcate spines of chaetiger 5 with a large lateral tooth on one side and a smaller accessory spur on the other side. Dipolydora trilobata (Radashevsky, 1993) is a closely similar species, but is maintained as distinct. Dipolydora anoculata (Moore, 1907) is probably a valid species and should be removed from the synonymy of D. giardi.
References
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