Cheumatopsyche diversa Thawarorit, Sangpradub & Morse

Thawarorit, Kitiya, Sangpradub, Narumon & Morse, John C., 2013, Five new species of the genus Cheumatopsyche (Trichoptera: Hydropsychidae) from the Phetchabun Mountains, Thailand, Zootaxa 3613 (5), pp. 445-454 : 448-449

Cheumatopsyche diversa Thawarorit, Sangpradub & Morse , sp. nov.

Figs. 2 a–d.

Diagnosis. The male genitalia of this species are distinctive among those of any other known species. The pair of broad, transverse, setose carinae on tergum X are especially conspicuous, perhaps homologous with much smaller transverse, setose elevations on tergum X of C. processuata Martynov, 1927 , or possibly C. banksi Mosely, 1942 . However, the apical lobes of tergum X are prominent in dorsal view and separated by a conspicuous cavity, unlike those of the other two species.

Description. (In alcohol) Head and thorax brown, abdominal segments pale cream. Legs pale with coxae and femora pale cream, tarsi light brown. Forewings grey and hind wings light grey.

Wings: Shape and venation characteristic of genus. Male forewing length 6.0– 6.5 mm (n=6).

Male genitalia: Segment IX in lateral view with anterolateral margins angled 60° at 2/3rds height, posterolateral margins setose, straight and sloped. Inferior appendages in lateral view each with basal segment reaching top of tergum X and slightly sinuous, apical segment short and acute ( Fig. 2 c); in caudoventral view with basal segment curved, apical segment broad, apically blunt ( Fig. 2 a). Segment X in lateral view with dorsal margin deeply concave basally, with broad, setose, transversely sloping carina rising above body of tergum, and with apical lobes angled dorsad away from sloping body of tergum ( Fig. 2 c); in dorsal view with median ridge extending length of tergum, interrupting broad transverse carina, apical lobes curved mesad and separated by wide concavity ( Fig. 2 b). Phallus curved in lateral view, its apex broad ( Fig. 2 c); in ventral view with median projection ( Fig. 2 d).

Etymology. The species name is a Latin adjective “diversus (-a –um),” an adjective meaning “different, unlike,” referring to the fact that the male of this species is very different from that of any other known species.

Holotype: Male. THAILAND: Loei Province, Phu Kradueng National Park, Tard Hong Waterfall (N 16° 48' 11.6", E 101° 43' 25.1"), elevation 417 m, 9-iii-2011, Coll. Kitiya Thawarorit, Teerasak Muakpetch, and Narumon Sangpradub (CU).

Paratypes: THAILAND: Chaiyaphum Province, Phu Khieo Wildlife Sanctuary, Tongto Stream (N 16° 24' 48.0", E 101° 34' 58.9"), elevation 795 m, 14-iii-2011, Coll. Kitiya Thawarorit, Teerasak Muakpetch, and Narumon Sangpradub, 1 male (KKU); Chaiyaphum Province, Phu Khieo Wildlife Sanctuary, Prom Stream (N 16° 27' 36.6", E 101° 39' 20.5"), elevation 577 m, 16-i-2011, Coll. Kitiya Thawarorit, Teerasak Muakpetch, and Narumon Sangpradub, 1 male (KKU).

Figures

FIGURE 2. Cheumatopsyche diversa sp. nov., male genitalia. 2 a, segment IX and inferior appendages, ventral; 2 b, segment IX + X, dorsal; 2 c, genitalia, left lateral; 2 d, phallus apex, ventral.