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

Figs. 5 a–f.

Diagnosis. The male genitalia of this species are close to those of Cheumatopsyche lucida Ulmer, 1907 , but can be distinguished by segment X posterior margin in dorsal view having the outer margins of its apicolateral lobes shallowly concave; in lateral view its apicolateral lobes are digitate and slightly divergent from the body of the tergite (the outer margins of the apicolateral lobes are convex in dorsal view and they are capitate and not divergent in lateral view in C. lucida ). The inferior appendages each have a basal segment more slender than in C. lucida and the apical segment has a basomesal angle in caudoventral view. The phallus in lateral view is more curved, longer and with its apex more slender.

Description. (In alcohol) Head and thorax brown. Abdominal segments light brown. Legs with coxae and femora brown, tibiae and tarsi light brown. Forewings and hind wings light brown.

Wings: Shape and venation characteristic of genus. Male forewing length 5 mm (n=1).

Male genitalia: Segment IX in lateral view with anterolateral margins convex through most of its height, posterolateral margins each produced into setose, rounded angle at 1/3rd of its height ( Fig. 5 e). Inferior appendages each with basal segment slender in caudoventral and lateral views ( Figs. 5 a, b, e), apical segment broad basally and slightly angled at 1/5th length in caudoventral view ( Figs. 5 a–b). Segment X posterior margin with apicolateral lobes curved slightly mesad, widely separated, and each with shallow concavity in otherwise convex lateral margin in dorsal view ( Fig. 5 d); in lateral view with apicolateral lobes digitate and slightly divergent from body of tergite ( Fig. 5 e). Phallus in lateral view long, deeply curved (slightly recurved), apically slender ( Fig. 5 c); in ventral view apex long, slender, and with lobes widely separated ( Figs. 5 f).

Etymology. The species names is a Latin adjective “cavus (-a –um),” an adjective meaning “hollow,” which refers to the outer margins of the apicolateral lobes being shallowly concave.

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).

Figures

FIGURE 5. Cheumatopsyche cava sp. nov., male genitalia. 5 a, segment IX and inferior appendages, ventral; 5 b, left inferior appendage, ventral; 5 c, phallus, left lateral; 5 d, segment IX + X, dorsal; 5 e, genitalia, left lateral; 5 f, phallus, ventral.