Rhyacophila inwabumensis spec. nov.

(Figs 2A–2C)

LSID urn:lsid:zoobank.org:act: B61711CA-BA9E-446C-9D14-E7D648495CF7

Holotype ♂ (pinned), Myanmar, Kachin, 15 km north of Kanphant, pass of Mt. Inwa Bum, 26°10’31.9”N 98°30’03.4”E, 3020 m, 4.10.2010, leg. S. Naumann, genitalia in glycerine vial (MfN).

Etymology. Named for Mt. Inwabum, where the type specimen was collected.

Diagnosis. The missing tergal straps and anal sclerites of the male genitalia refer this species to a clade in the R. curvata Branch. The species seems to have an isolated position due to the architecture of segment IX and the presence of a vertical fold on the median side of the coxopodite. We have not found a species with similar genitalia in the literature (cf. Kimmins 1953; Ross 1956; Schmid 1971; Sun & Yang 1995; Malicky & Yang 1995; Malicky & Sun 2002).

Description. Length of each forewing 6.9 mm. Head and thorax black; maxillary palpi and antennae brown; legs pale brown, spurs darker; forewings slender, with grey-brown membrane evenly covered by short, gold-brown hairs, not forming distinct wing pattern; hind wings slender, membrane grey.

Male genitalia (Figs 2A–2C). Segment IX ring-like, nearly parallel-sided in lateral view; coxopodite longer than harpago, with vertical fold on inner side; segment X plate-like, in horizontal position, inserted basally within segment IX, segment X separated into broad central part and pair of apicoventral processes, each bearing single bristle; phallic apparatus with thin, rod-like aedeagus, slightly longer than pair of slender parameres with bifid tips.