Potamyia korasha OLÁH & BARNARD, 2006

Oláh, J., P. C & Malicky, H., 2006, A revision of the lotic genus Potamyia BANKS 1900 (Trichoptera: Hydropsychidae) with the description of eight new species, Linzer biologische Beiträge 38 (1), pp. 739-777 : 746-747

Potamyia korasha OLÁH & BARNARD nov.spec. (Fig. 5)

Male (in alcohol). General colour fuscous. Antennae 12 mm, less than twice length of forewing. Spur formula 044 (244 in female). Tarsal claws asymmetrical, outer one covered by bunch of black bristles (symmetrical and free in female). Forewing 8 mm. Crossveins M3+4-Cu1 and Cu1-Cu2 not touching, crossvein Cu1-Cu2 exactly its own length basad of M3+4-Cu1, Cu2 and A joining before C, crossveins Sc-R1 and R1-R2+3 absent, pterostigmal area enlarged, less pigmented in holotype, but heavily pigmented in paratype. In hindwing, stem of M plus proximal part of M3+4 almost touching and running parallel with Cu1, fork 1 present, Sc and R1 joining only at around the crossvein closing discoidal cell (R2+3-R4).

Male genitalia. Ninth abdominal segment annular, anteriorly rounded, slightly narrowed in lateroventral corner, dorsum narrow, median keel connecting ninth and tenth tergum long and visible in dorsal view as elongated median process. Apical lobe on posterolateral margin developed, not covering half of clasper. Tenth tergum elongated horizontally with well-developed upcurved hook-like bifid apex. Excision broad and triangular. Setose warts very elevated, separated and situated on middle of tergum. Clasper moderately robust, basal segment widening after midpoint, caudal segment with pointed ventral tip. Phallotheca with elongated and enlarged base; dorsum straight, whole distal portion upcurved without widening rim at articulation with endothecal process. Ventral surface sinuate. Subapical ventral keel well developed, long, contributing to bulbous configuration of phallic distal portion. Phallotremal sclerites large, rounded without tapering apex. Sclerous band of endophallus just visible. Lobules of ventral endothecal lobe long, occupying most of subapical ventral keel. Endothecal process semicircular, its articulation plane vertical, occupying whole end of phallic apparatus.

This species is distinguishing from all others in the genus by the well-separated, hooklike and upcurved bifid apex of the tenth tergum, the long lobules of the ventral endothecal lobe and the upcurved distal end of the phallic apparatus. This was the first Potamyia species discovered in Madagascar. Accordingly it is named as 'distant' from the known distribution of the genus, 'korasha' meaning distant in Sanscrit.

H o l o t y p e: Madagascar, Moheli Island, October 1955 (Paulian). 1 p a r a t y p e:Moheli Island, Fomboni, at residence light, June 1954 (Millot and Paulian). (All in J. Oláh collection).