Potamyia karafa 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 : 745-746

Potamyia karafa OLÁH & BARNARD nov.spec. ( Fig. 4 )

Male (in alcohol). General colour dark fulvous. Antennae 19 mm, twice as long as forewing. Spur formula 144. Tarsal claws asymmetrical, outer one covered by bunch of black bristles. Forewing 9.5 mm. Crossveins M3+4-Cu1 and Cul-Cu2 not touching, crossvein Cu1-Cu2 one-and-a-third its own length basad of M3+4-Cul, Cu2 and A joining before C, crossveins Sc-R1 and Rl-R2+3 absent, pale pterostigmal area enlarged. In hindwing, stem of M plus proximal part of M3+4 touching and running parallel with Cu1, fork 1 present, Sc and R1 joining only at around crossvein closing discoidal cell (R2+3-R4).

Male genitalia. Ninth abdominal segment annular, anteriorly regularly rounded, dorsum narrow, median keel long and visible in dorsal view as an elongated median process. Apical lobe on posterolateral margin not strongly developed, but with additional small lobes visible above it. Tenth tergum elongated horizontally with narrow excision forming very characteristic bifid apex, both lobes large, broad and rounded on both sides, resulting in significant subapical narrowing of tenth tergum in dorsal view. Setose warts not elevated, well separated on middle of tergum. Clasper moderately robust, basal segment widening after midpoint, caudal segment with blunt rounded apex except for medially directed pointed tip on apex. Phallotheca with elongated and enlarged base, dorsum very straight up to the tip of the phallus without upcurving. Ventral surface more triangular than sinuate. Subapical ventral keel not wide but very long, forming triangular configuration of the ventrum. Phallotremal sclerites vertically elongated and rounded. Sclerous band of endophallus just visible. Lobules of ventral endothecal lobe very small, membranous. Endothecal process elongated, semicircular and shifted to a more vertical position so its articulation plane is not vertical but ventrally oblique; a sharp narrowing at ventral meeting plane of endothecal process and distal end of subapical ventral keel.

This species is most closely related to P. korasha but has the spur formula 144, and differs in the venation, phallic apparatus and tenth tergum. The species is named after part of the type locality.

H o l o t y p e: Madagascar, Ampijoroa, Forest Ankarafantsika, 30 August 1956 (Griveaud). (J. Oláh collection).

Figures

Fig. 4: Potamyia karafa nov.spec., Fig. 5: Potamyia korasha nov.spec., Fig. 6: Potamyia tofina nov.spec.