Setodes wirhal, Oláh & Johanson, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Fifteen new Trichoptera (Insecta) species from Sumatra, Indonesia, Zootaxa 2618 (1), pp. 1-35: 32-33

publication ID 10.11646/zootaxa.2618.1.1

persistent identifier

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scientific name

Setodes wirhal

new species

Setodes wirhal   , new species

Figs 66–68 View FIGURES 66–68

This species is very close to S. musagetes Malicky & Chantaramongkol   from northern Sumatra. It differs by having a truncate basoventral corner of segment IX, slightly pigmented segment X that is excised apicomesally (not with an apicomesal process); and very slender basodorsal processes of the gonopods.

Male. Body pale brown, eyes black. Scapes shorter than head, without elongate setal tufts; setae present on mesal surfaces of scapes and shorter than pedicels, but not arranged in pencils. Maxillary palp formula I-II- (IV,V)-III. Anterior surface of head characterized by narrow frontal area and enlarged genal areas; anterior tentorial pits demarcating frontal, genal, and clypeal cranial areas almost indiscernible; wide frontogenal areas almost fully occupied by large frontogenal compact setose warts. Small, rounded clypeogenal compact setose wart present on clypeogenal cranial area just above articulation of each maxillary palp segment I. Labrum elongated axially; posterior part covered with diffuse setal wart. Haustellum base narrow, broad at mid-length, with mesal distal hump; posterior half covered with parallel channels. Head dorsum with pair of large, ovoid, compact occipital setose warts; pair of rounded vertexal ocellar compact setose warts; single, large inverted Vshaped vertexal medioantennal compact setose wart dominating between and behind scapes; postgenal compact setose warts reduced in size, attached to ocular groove ventrally as narrow warts invisible in dorsal view. Coronal, lateral vertexal, occipital, and postoccipital grooves forming dark brown lines on head dorsum. Cranial areas and warts medium brown. Swollen proepisternal setal wart absent. Katepisternum of each mesopleuron acute anterodorsally.

Spur formula 0,2,2; middle leg anterior apical spurs each 3 times longer than posterior apical spurs; hind leg posterior apical spurs each 1.5 times longer than anterior apical spurs; middle leg apical spurs smaller than hind leg apical spurs.

Forewings 4.5 mm long; pale, without pattern.

Male genitalia. Segment IX triangular; with truncate basoventral corner in lateral view, narrowing gradually to constricted tergal region; lateroventrally setose, few setal alveoli present on tergum and along borders between segment IX and paraproctal plates. Segment X fused to tergum IX; shorter than paraproctal plates, sunken apically between paraproctal plates; slightly excised apicomesally in dorsal view; less sclerotized than paraproctal plates; covered with few minute setae. Paraproctal complex forming phallic guide; fused to tergum IX and lateral part of venter of segment X, forming broad plates. Paraproctal plates broad basally, extending ventrad into shining, narrow bands down to gonopod articulations; protruding apicad; apically triangular. Cerci forming small, setose surfaces around juncture of segment IX, segment X, and paraproctal plates; clearly visible in lateral view. Gonopods each 5-branched; ventral and dorsal digitiform branches longest, subdorsal broadest, remaining branches minute; dorsal process slender, filiform. Phallic apparatus with broad, weakly pigmented, indistinct, phallobase; membranous, amorphous endotheca; and single, slender arciform paramere reaching distal end of lateral flange of phallicata. Phallicata arching, parallel with paramere; with pair of dorsal flanges at mid-length, housing phallotrema in trough between flanges and inconspicuous phallotremal sclerites. Phallicata with membranous, tapering apex in lateral view.

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

Distribution: Indonesia (Sumatra).

Etymology: Wirhal, from wirhala, “thin” in Sanskrit, referring to the slender, filiform basodorsal process on each gonopod.