Potamyia andoba 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 : 743-744

Potamyia andoba OLÁH & BARNARD nov.spec. ( Fig. 1 )

Male (in alcohol). General colour dark fuscous, head and thoracic sclerites almost piceous. Antennae broken. Spur formula 244; tarsal claws symmetrical, not hidden in bunch of black bristles. Forewing 6 mm. Venation with several differences from the typical Potamyia pattern: crossveins M3+4-Cul and Cul-Cu2 almost touching, crossvein Cul-Cu2 slightly basad of M3+4-Cul, Cu2 and A joining before C, crossveins Sc-R1 and R1-R2+3 present, sclerotized pterostigmal area enlarged. In hindwing stem of M plus proximal part of M3+4 not touching, well separated but parallel with Cu1, fork 1 present, Sc and R1 joining well before crossvein R2+3-R4.

Male genitalia. Ninth abdominal segment annular, anteriorly rounded with abruptly narrowing lateroventral corner. Dorsum narrow, median keel short and visible in dorsal view as a small median triangular projection. Apical lobe on posterolateral margin developed into a rounded, almost semicircular lobe shifted towards the middle of the segment and not covering the clasper base. Tenth tergum elongated horizontally with triangularly excised bifid apex curved up and outwards. Setose warts well developed, elevated, coalesced and occupying the whole basal half of the tenth tergum. Basal segment of clasper slender, almost parallel-sided especially in ventral view. Apical segment slightly bifid, ventral lobe more developed. Phallotheca with elongated and enlarged base, dorsum concave and ending with abruptly upcurving margin at articulation with endothecal process; ventral surface sinuate. Subapical ventral keel well developed, dominating bulbous formation of caudal portion. Phallotremal sclerites well developed, compact and rounded both in lateral and dorsal views. Sclerous band of endophallus just visible. One pair of membranous lobules representing ventral endothecal process. Endothecal process forming caudal lips of the phallic apparatus semicircular, its articulation plane vertical, almost as wide as subapical portion.

This species is easy to distinguish from all others in the genus because of the combination of plesiomorphic characters: tibial spur formula 244; claws symmetrical; crossveins Sc-R1 and R1-R2+3 present; M and Cu not touching, well separated; and the large setose warts representing the fused superior (preanal) appendages). This species is named after the type locality.

H o l o t y p e: Madagascar, Tulear Province, Antsalova District, Andobo, Antsingy forest, Natural Reserve, March 1959 (Paulian) (J. Oláh collection).

Figures

Fig. 1: Potamyia andoba nov.spec., Fig. 2: Potamyia andria nov.spec., Fig. 3: Potamyia ifanadiana nov.spec.