Cheumatopsyche tongto 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 : 451

Cheumatopsyche tongto Thawarorit, Sangpradub & Morse sp. nov.

Figs. 4 a–e.

Diagnosis. The male genitalia of this species are similar to those of C. triangula Thawarorit, Sangpradub & Morse , n. sp., and C. chryseis Malicky & Chantaramongkol, 1997 . However, they differ in that segment X in lateral view is more curved than C. triangula on its dorsal margin ( C. chryseis is angled dorsally) and blunt apically ( C. triangula is acute apically). The inferior appendages each have an apical segment that is more sinuous in caudoventral view than either species. Like C. triangula , the apex of the phallus lacks an apicoventral projection in lateral view (present in C. chryseis ).

Description. (In alcohol) Head and thorax brown. Abdominal segments light brown, legs light brown. Forewings brown and hind wings light brown.

Wings: Shape and venation characteristic of genus. Male forewing length 5 mm (n=2).

Male genitalia: Segment IX in lateral view with anterolateral margins nearly straight in dorsal 3/4ths, posterolateral margins each produced into setose triangle above base of corresponding inferior appendage ( Fig. 4 c), in dorsal view anterior and posterior margins angled caudad, with lobes of setose ridge short. Inferior appendages each with slender basal segment ( Figs. 4 a, c), apical segment sinuous and acute in caudoventral view ( Fig. 4 a). Segment X in dorsal view with posterior margin rounded medially and with apicolateral lobes short and round, slightly protuberant, setose ( Fig. 4 b); in lateral view with dorsal margin curved dorsad, long, blunt apically ( Fig 4 c). Phallus in lateral view curved, its apex lacking apicoventral projection ( Fig. 4 d–e).

Etymology. The species name derives from “ Tongto Stream,” the type locality of this new species.

Holotype: Male. 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 (CU).

Paratype: Same data as holotype, 1 male (KKU).

Figures

FIGURE 4. Cheumatopsyche tongto sp. nov., male genitalia. 4 a, segment IX and inferior appendages, ventral; 4 b, segment IX + X, dorsal; 4 c, genitalia, left lateral; 4 d, phallus apex, ventral; 4 e, phallus, left lateral.