Setodes trikuthia, Oláh & Johanson, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Fifteen new Trichoptera (Insecta) species from Sumatra, Indonesia, Zootaxa 2618 (1), pp. 1-35: 30-32

publication ID 10.11646/zootaxa.2618.1.1


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scientific name

Setodes trikuthia

new species

Setodes trikuthia   , new species

Figs 60–65 View FIGURES 60–65

This species is similar to S. nausikaa Malicky & Chantaramongkol   , known from several localities in northern Sumatra. Setodes trikuthia   , new species, is easily separated from S. nausikaa   by the following male genitalic characters: segment IX in lateral view is vertically elongate and nearly rectangular, not pyriform; shorter modified cerci are fused with the juncture of tergum IX, segment X, and the paraproct; and the apical pattern of gonopods is characterized by presence of 3 rounded, sinuous, excisions visible among the apical lobes, not by only a single excision.

Male. Body pale, eyes black. Scapes shorter than head, without elongated setal tufts; long setae present on mesal surfaces of scapes. Maxillary palp formula V-IV-I-II-III. Anterior surface of head (or cephalic face) characterized by narrow frontal area and large genal areas; anterior tentorial pits almost indiscernible; wide frontogenal areas almost fully occupied by frontogenal compact setose warts. Clypeogenal compact setose warts small, rounded, present on clypeogenal cranial area above articulation of each maxillary palp segment I. Labrum elongate axially, posterior part covered with diffuse setal wart. Haustellum narrow at base; broad at mid-length; with mesodistal hump; posterior half with parallel channels. Head dorsum with pair of large, ovoid compact occipital setose warts; pair of rounded, vertexal ocellar compact setose warts; and single, large, nearly diamond-shaped vertexal medioantennal compact setose wart dominating on head dorsum between and behind scapes. Postgenal compact setose warts small, ventrally attached to ocular groove 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 mesopleura acute anterodorsally.

Spur formula 0,2,2; middle leg anteroapical spurs each 3 times longer than posterior spurs; hind leg anteroapical spurs each half as long as posteroapical spurs; middle leg apical spurs shorter than hind leg apical spurs.

Forewing length 6.2 mm.

Male genitalia. Segment IX short, quadrangular in lateral view, tergal region constricted; lateroventrally setose; setal row present behind borders of segment IX and paraproctal plates. Segment X fused with tergum IX; long, trapezoid, slightly excised apicomesally in dorsal view; weakly sclerotized, covered with few minute setae; bordered laterally by well-developed paraproctal plates. Paraproctal complex forming phallic guide; fused to tergum IX and laterally to venter of segment X into pair of broad plates. Paraproctal plates broad basally, protruding apicad; each with apex rounded and with pair of dark ventrolateral spines. Cerci setose, reduced to setose foliform surfaces in lateral view. Gonopods short, each with 4 apical lobes with elevated alveolar tubercles of various sizes; 3 sinuous excisions present among apical lobes; gonopods bilobed in ventral view. Phallic apparatus with short phallobase; endotheca membranous, amorphous; with paired, slender arciform parameres, right paramere short, not reaching lateral flange of phallicata. Phallicata arching similarly to parameres; slender, with pair of subapical dorsal flanges; with phallotrema in trough between flanges and inconspicuous phallotremal sclerites. Phallicata excised mesally at apex in dorsal view, producing 2 dorsad-turning, hook-shaped, terminal corners.

Holotype male: INDONESIA (Sumatra): Kerinci National Park, Tapan Road , 1000 m, 10.vii.2008, light trap [J. Oláh, Jr.]— 1 male (OPC, in alcohol).  

Paratypes: same data as holotype— 2 males (OPC, in alcohol)   .

Distribution: Indonesia (Sumatra).

Etymology: Trikuthia, from tri, “three,” kuthin, “sinus” in Sanskrit, referring to the three-sinuous-pattern of the gonopods in lateral view.