Stenopsyche dakpri, Hoang, Duc Huy & Bae, Yeon Jae, 2007

Hoang, Duc Huy & Bae, Yeon Jae, 2007, Vietnamese species of Stenopsyche McLachlan (Trichoptera: Stenopsychidae), Zootaxa 1624, pp. 1-15 : 4-7

Stenopsyche dakpri sp. nov. ( Figs. 2 a–2j, 3a– 3g)

Male. Body 13 mm; forewings 17 mm. Body color light brown, occasionally with black or brown punctation. Head: Antennae 26 mm, dark brown. Thorax: Foretibiae, foretarsi, midtibiae, and midtarsi with blackish brown bands; remainder parts of legs yellow. Spur formula 3. 4. 4. Forewings: Forewings ( Fig. 2 a) narrow, elliptical, apically somewhat pointed, brown, with many light speckles; Sc and R1 separate; forks I, II, III, IV, and V present; fork I petiolate; fork V formed by Cu1a and Cu1b; discoidal cell small; median cell narrow and medium in size; thyridial cell long; nygmata present on fork II; Cu2 fused with 3A; Cu-A present; A1-A2 present; A thickened defining fold in posterior C. Hind wings: Hind wings ( Fig. 2 b) shorter, with much broader anal area, white, opaque; venation typical to genus; Sc thickened, contiguous with R1 but separate; R1 and R2+3 merged with Sc; forks II, III, and V present; fork V with long petiolate; discoidal cell small; thyroidal cell large long; nygma on fork II; veins between Cu and anal veins anastomosed. Male genitalia ( Figs. 2 e– 2g): Tergite VIII with fringe of setae on anterior margin. Segment IX with lateral processes (ca. 1/ 8 x length of preanal appendages). Segment X dorsum with heavily sclerotized median lobe, with intermediate appendages curved medially, nearly as long as segment X. Inferior appendages rectangular in ventral view; medial edges straight; medial apices acute; lateral apices posteriorly obtuse; superior arms basal half straight distally contorted with two sharp projections. Phallus with armature of endotheca comprising scale-like spines.

Female. Body 13.5 mm; forewings 15.8 mm. Head: Antennae 20–21 mm, dark brown. Thorax: Foretibiae, foretarsi, midtibiae and midtarsi with blackish brown bands; remainder parts of legs yellow; tibiae and tarsi slightly flattened laterally. Spur formula 3. 4. 4. Wings: ( Figs. 2 c–2d) similar to male, but apex of forewings somewhat blunt anal area of hind wings narrower. Female genitalia ( Figs. 2 h–2j): Segment VIII with setose sternite. Segment IX and X fused; segment IX sclerotized, dark brown, with bristles laterally; segment X membranous, yellow, with posterolateral corners forming small setose semisclerotized lobes. Gonopore with pair of hairy vulva scales. Segment XI with two pairs of lobes; posteroventral lobes membranous, basally broad, with tiny cerci apically; dorsolateral lobes semisclerotized setose.

Larva. Body 32 mm, width 3.5 mm. Sclerites brown, with distinct punctate pattern. Head: Head ( Figs. 3 a–3e) 3.6 mm, width 1.4 mm, posteriorly somewhat wider, dorsally slightly concave ventrally convex in lateral view; ground color reddish brown, with distinct punctate pattern throughout head surfaces, with light markings around eyes; setae relatively long, moderately thick, brown. Frontoclypeus with straight anterior margin. Labrum with yellow hairs near anterior membranous margin. Mandibles robust, dark brown, with apical teeth; left mandible with brush of setae on median depression. Mentum slightly oblong; submentum dark brown, with yellow median process, with setae on anterior angles. Thorax: Thoracic nota ( Fig. 3 b) cylindrical, oblong, yellowish brown with distinct punctate pattern and broad black posterior margin, with median suture, with few long setae; anterior margin with fringe of short slender setae. Prothoracic pleura ( Fig. 3 d) brown; epimeron surrounding coxa with black median part and posterior margin. Posterior prosternite ( Fig. 3 f) with relatively large, black median part extending posteriorly at both sides. Forecoxae with two large dorsal conical processes ( Fig. 3 g): basal process 0.4 mm, with seta near apex; apical process 0.6 mm, slightly curved downward. Legs nearly equal in length, yellowish brown; femora slightly broader apically, punctate; claws bifid, hooklike. Abdomen: Abdomen almost uniformly broad, greenish grey in living specimens, purple in alcohol, with scarce setae. Anal prolegs brown, stout, with few dark setae; claws hooklike.

Diagnosis. The male adult of S. dakpri is similar to S. hamata Navás , but it can be distinguished by the shape of the anterolateral margin of abdominal segment X, rectangular inferior appendages, contorted superior arms, and preanal appendages which are covered with setae more than distal half of it ( Figs. 2 e– 2g). The larva of S. dakpri can be distinguished from other species of Stenopsyche by the distinctive punctate pattern of head ( Figs. 3 a–3e), long dorsal processes of forecoxae ( Fig. 3 g), and thickened median part of posterior prosternite ( Fig. 3 f).

Material examined. Holotype: male (SWU-TRI-1792), VIETNAM, Dak Lak Prov., Dak Song County, Dak Pri Creek, alt. 630 m, 19 iv 2003, by black light trap, D.H. Hoang, deposited at SWU-AIC. Paratypes: 1 male (SWU-TRI-1793), same data as holotype; 1 male & 1 female (SWU-TRI-1794, wings on slide), same locality as holotype, 13 iv 2003, D.H. Hoang; 4 males (SWU-TRI-1795, 1796, 1797), same locality as holotype, 11, 13 & 17 iv 2003, D.H. Hoang; 7 larvae (SWU-TRI-1798), same locality as holotype, 630 m at riffle, 19 iv 2003, D.H. Hoang; 20 larvae (SWU-TRI-1799, 1800), same locality as holotype, 740 m at riffle, 5 iii 2001, D.H. Hoang. Other material: Thua Thien–Hue Prov.: 4 larvae, Bach Ma National Park, Tri Sao waterfall, 19 vi 2001. Lam Dong Prov.: 14 larvae, Bao Loc, Da M’re Creek, alt. 290–430 m, 22 & 23 iii 2002, D.H. Hoang & V.V. Nguyen.

Etymology. This species is named after the type locality, Dak Pri Creek.

Distribution. Central and Southern Vietnam (Dak Lak Prov., Thua Thien–Hue Prov., Lam Dong Prov.).

Figures

FIGURE 2. Stenopsyche dakpri, sp. nov. a – d: wings. a: male forewing; b: male hind wing; c: female forewing; d: female hind wing. e – g: male genitalia. e: dorsal; f: lateral; g: ventral. h – j: female genitalia. h: dorsal; i: lateral; j: ventral.

FIGURE 3. Stenopsyche dakpri, sp. nov. a – g: full-grown larva. a: dorsal head; b: dorsal prothorax; c: lateral head; d: lateral prothorax; e: ventral head; f: ventral prothorax; g: processes of right forecoxa.