A new species of Ancorabolidae (Copepoda, Harpacticoida) from the Beagle channel (Chile)

A new species of the family Ancorabolidae Sars, 1909 (Copepoda, Harpacticoida), Arthropsyllus australis sp. n. was collected 1994 during 'Magellan Campaign' of RV 'Victor Hensen' and is described in the present paper. Its inclusion in the genus Arthropsyllus Sars, 1909 is justified by the diagnostic characters of the genus: lack of any dorsal or dorsolateral well-developed processes, body slightly depressed dorsoventrally, body somites with lateral epimeres except cephalothorax and last two abdominal somites. A. australis sp. n. differs from Arthropsyllus serratus Sars, 1909 in the shape of the rostrum, in having moderately-sized sensilla-bearing dorsal and dorsolateral projections on cephalothorax and body somites, and in several differences on mandible, maxillule, maxilla and swimming legs.