REDESCRIPTION OF THE ARCTIC-BOREAL SPECIES CALATHURA-BRACHIATA (STIMPSON, 1853) (ISOPODA, ANTHURIDEA, PARANTHURIDAE)

Calathura brachiata (Stimpson, 1853) has been found in the North Atlan tic, north of Iceland and northeast of Greenland; 750 specimens have b een investigated. Although this species is quite large and widely dist ributed, the identification was complicated by the fact that the synon ymy with Calathura norvegica (Sars, 1872) and Anthura arctica (Heller, 1875) had not yet been satisfactorily resolved. Moreover, the descrip tions of these species were either incomplete, or it was difficult to recognize the species from the illustrations. We therefore present a c omplete redescription of manca stages 2 and 3, as well as of an adult female, on the basis of our material from the North Atlantic, together with a redescription of an adult male based on museum material.