Psychomyia selatana, Oláh & Johanson, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Fifteen new Trichoptera (Insecta) species from Sumatra, Indonesia, Zootaxa 2618 (1), pp. 1-35 : 9-10

Psychomyia selatana , new species

Figs 12–15

This species is most similar to Psychomyia anaktiri Malicky from northern Sumatra. It differs from that species by having the following characteristics: 2-spined dorsobasal process on each harpago, not singlespined; harpagones nearly triangular in lateral view, not rod-shaped; large and strong cerci that are S-shaped in lateral view, not straight; mesal structures of the cerci more heavily sclerotized; segment X with smaller subapical lobe; and lobes in the middle of segment X large, subquadrate, not small and spine-like.

Male. Body and forewings generally pale brown. Dorsal thoracic sclerites medium brown, setal warts on head and thorax lighter; grooves dark; cranial areas medium brown; warts light brown. Maxillary palp formula I-IV-III-II-V. Compact setal wart absent on cervix and cervical sclerites. Pair of lateral cervical sclerites with slender anterior arms broadening gradually from midway, broadest immediately before apex; apex curving slightly ventrad toward articulation with proepisternum. Cervical sclerites each composed of narrow, slender, anterior arm articulating anteriorly with corresponding occipital condyle above posterior tentorial pit at back of head; fused to posterior cervical sclerite. Posterior cervical sclerites each forming plate reaching prothoracic episternum; articulating to weakly sclerotized anteromedian band of prothoracic eusternum by thin, ventral intercervical sclerite. Swollen proepisternal setal wart absent.

Spur formula 2,4,4; foreleg posteroapical spur half as long as anteroapical spur; middle leg anteroapical and anterosubapical spurs about 2/5ths posterior spur lengths; hind leg anteroapical and anterosubapical spurs 1/6th as long as posterior spurs.

Forewings 2.6 mm long; crossvein m indiscernible, median cell apparently open; hyaline, window-like line on longitudinal M pronounced.

Male genitalia. Segment IX with robust, quadrangular sternite and small weakly sclerotized tergite. Cerci large, elongate, S-shaped in lateral view; separated from posterodorsal margins of sternite IX by conspicuous sutures. Lateral branches of segment X fused with mesal surfaces of cerci; heavily sclerotized without dorsal setae; in dorsal view sclerotized, almost black, in dorsal view composed of broad subapical mesal lobe and slender apical lobe. Gonopods small; coxopodites fused medially; harpagones setose nearly triangular in lateral view; each with small, setose dorsodistal and dorsoproximal lobes diverging; dorsobasal, spine-like processes of harpagones without setae, each with 2 spines, projecting dorsad and turning posterad. Basal plate of gonopods weakly developed, connected to basal part of phallic organ. Paraprocts large; posterior part of paraprocts shorter than and located between cerci, each S-shaped in lateral view, with wide posterior half, ventral margin convex, and dorsal margin produced into 2 pointed hooks; in dorsal view, laterad-curving small black spine visible mainly at mid-length of dorsum of paraproctal plate. Each paraproctal plate fused to dorsal base of cercus, produced anterad into anterior part of paraprocts along dorsal margin of sternite IX; articulating with posterodorsal corner of phallobase; with phallic apodeme (not illustrated) forming guiding structure for phallotheca. Phallic apparatus composed of large, weakly sclerotized, quadrangular phallic apodeme and slender phallotheca fixed to fulcrum by anterior straps of paraproctal plates. Phallotheca projecting dorsad before turning posterad and ventrad before dorsad-curving apex. Tiny, upward-turning apex probably representing phallicata. Phallic apodeme and phallotheca meeting near basal plate of gonopods.

Holotype male: INDONESIA (Sumatra): Bukit Barisan Selatan National Park, Barisan Mts., Way Pitias , 800 m, 17–19.vi.2008, light trap [J. Oláh, Jr.]— 1 male (OPC, in alcohol).

Paratypes: same data as holotype— 24 males (OPC, in alcohol) .

Distribution: Indonesia (Sumatra).

Etymology: Selatana, after the type locality.

Remark: Some assumed females of this species are stored together with paratypes.

Figures

FIGURES 12–15. Psychomyia selatana, new species, holotype. 12—genitalia, left lateral; 13—phallic apparatus, left lateral; 14—left side of genitalia, dorsal; 15 —gonocoxites, ventral.