Cheumatopsyche recta, Thawarorit, Sangpradub & Morse, 2013

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 : 446

Chematopsyche recta Thawarorit, Sangpradub & Morse, sp. nov.

Figs. 1 a–e.

Diagnosis. The male genitalia of this species are similar to those of Cheumatopsyche charites Malicky & Chantaramongkol, 1997 , but can be distinguished by the anterolateral margins of segment IX being more nearly straight (convex in C. charites ). The tergum X posterior margin has two apicolateral lobes that are each relatively broader than in C. charites in dorsal view and separated from the middorsal hump by a longer cavity in lateral view. The inferior appendages each have the apical segment more curved in caudoventral view. The phallus also differs in lacking a constriction at mid-length (constricted in C. charites ).

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

Wings: Shape and venation characteristic of genus. Male forewing length 5.0– 5.2 mm (n=2).

Male genitalia: Segment IX in lateral view with anterolateral margins nearly straight in dorsal 3/4ths, posterior margin convex especially at 1/3rd height ( Fig. 1 c); anterodorsal margin raised and forming transverse bridge with setose lobes contiguous ( Fig. 1 b). Tergum X in lateral view with mid-dorsal hump near middle of segment and setose lobes apically ( Fig. 1 c); in dorsal view with two broad apicolateral lobes separated by wide cleft ( Fig. 1 b). Inferior appendages in caudoventral view each with apical segment sinuous ( Fig. 1 a). Phallus with dorsal and ventral margins nearly parallel in lateral view ( Fig. 1 e).

Etymology. Latin “rectus (-a –um),” an adjective meaning “straight,” referring to the nearly straight anterolateral margins of segment IX.

Holotype: Male. THAILAND: Chaiyaphum Province, Phu Khieo Wildlife Sanctuary, Prom Stream (N 16° 27' 36.6", E 101° 39' 20.5"), elevation 577 m, 15-iii-2011, Coll. Kitiya Thawarorit, Teerasak Muakpetch, and Narumon Sangpradub (CU).

Paratype: THAILAND, Phetchabun Province, Thung Salaeng Luang National Park, Chompoo Stream (N 16° 41' 10.6", E 101° 43' 06.3"), elevation 78 m, 21-xi-2010, Coll. Kitiya Thawarorit, Teerasak Muakpetch, and Narumon Sangpradub, 1 male (KKU).

Figures

FIGURE 1. Cheumatopsyche recta sp. nov., male genitalia. 1 a, segment IX and inferior appendages, ventral; 1 b, segment IX + X, dorsal; 1 c, genitalia, left lateral; 1 d, phallus apex, ventral; 1 e, phallus, left lateral.