ASTEROCHERES-FLUSTRAE N. SP. (COPEPODA, SIPHONOSTOMATOIDA, ASTEROCHERIDAE) ASSOCIATED WITH FLUSTRA-FOLIACEA L. (BRYOZOA) FROM THE WHITE SEA

Asterocheres flustrae n. sp. is described from Flustra foliacea L. (Br yozoa) found in the Kandalaksha Bay of the White Sea. This is the firs t siphonostomatoid copepod to be reported in association with a bryozo an. Distinctive features of the new species are: (I) a female with 21- and male with 18-segmented antennules; (2) five setae on the inner lo be of the maxillule with one much reduced; (3) an aesthetasc on the sy ncoxa of the maxilla; (4) a 6-segmented maxilliped with a distal claw; and (5) the armature of endopodal segments 2, 1, 1 and 1. Sexual dimo rphism was observed not only on the antennules, but also for maxillipe d and legs 1-6. By using SEM some new fine structures were revealed, i ncluding: one seta on each of antennulary segments 1 to 4, 6 and 8 wit h a nipple-like tip and an apical pore surrounded at its base by a cir clet of cuticular denticles; a rostral region having a circular area o rnamented with minute cuticular protuberances; and the labrum ornament ed with fine hair-like setules on either side of its apex.