Potamyia ifanadiana 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

Potamyia ifanadiana OLÁH & BARNARD nov.spec. (Fig. 3)

Male (in alcohol). General colour fulvous. Antennae 29 mm, more than twice length of forewing. Spur formula 044 (244 in female). Tarsal claws asymmetrical (symmetrical in female) partly covered with light bristles. Forewing 13 mm. Crossveins M3+4-Cul and Cul-Cu2 not touching, crossvein Cul-Cu2 more than its own length basad of M3+4-Cul, Cu2 and A joining before C, crossveins Sc-R1 and R1-R2+3 absent in holotype but present in atrophied form in some paratypes, 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 R2+3-R4.

Male genitalia. Ninth abdominal segment annular, anteriorly rounded, dorsum narrow, median keel very short. Apical lobe on posterolateral margin developed into semicircular lobe covering half base of clasper. Tenth tergum elongated horizontally with quadrangularly excised bifid apex. Setose warts elevated and enlarged but separate and located around middle of tergum. Clasper basal segment almost parallel-sided. Caudal segment short with rounded apex except for small, medially directed, pointed projection. Phallotheca with elongated and enlarged base, dorsum and ventrum straight, resulting in parallel-sided central portion. Dorsal distal portion upcurved and covered by endothecal processes. Phallotremal sclerites large and rounded; end of sclerous band of endophallus heavily sclerotized and clearly visible. Subapical ventral keel short and so wide that almost globular endothecal processes do not cover whole ending of phallotheca. Lobules of ventral endothecal lobe very large.

This is the largest known Potamyia species , easily distinguished simply by its size and by the peculiar ending of the phallic apparatus, especially the large lobules of the ventral endothecal lobe. The species was collected from five locations in the central region of East Madagascar, and is named after the type locality.

H o l o t y p e: Madagascar, Ifanadiana , Ranomafana, March 1955 (Paulian). P a r a t y p e s: 6 5: same data as holotype ; 2: Madagascar, Ampangalambolosy , 9 October 1957 (Soga) ; 1 Madagascar, Anivoraus Kely , Riviera Ivoay, Brickaville, September 1954 (Paulian), 6: Madagascar, Perinet, September 1954 (Viette & Paulian) ; 1 2: Madagascar, Anosibe , 1955 (Paulian). (All in J. Oláh collection) .