Stenopsyche angustata Martynov 1930

Hoang, Duc Huy & Bae, Yeon Jae, 2007, Vietnamese species of Stenopsyche McLachlan (Trichoptera: Stenopsychidae), Zootaxa 1624, pp. 1-15 : 2-4

Stenopsyche angustata Martynov 1930 ( Figs. 1 a–h)

Stenopsyche angustata Martynov 1930: 74 (male; Chin Fu San, Southwestern China); Schmid 1969: 201 (male; redescription).

Male. Body 13 mm; forewings 20–21 mm; antennae 35–38 mm. The male was described in detail by Martynov (1930).

Female. Body 14 mm; forewings 21 mm. Head: Antennae 28–30 mm, dark brown. Female genitalia ( Figs. 1 a–1c): Segment VIII with strongly setose sternite. Segment IX and X fused; segment IX sclerotized, short, dark brown; segment X membranous, brown, with posterolateral corners forming small semisclerotized setose lobes. Gonopore with pair of hairy vulvar scales. Segment XI with two pairs of lobes; posteroventral membranous lobes dark brown, basally broad with tiny cerci apically, with large dorsolateral setose semisclerotized lobes.

Larva. Body 36 mm; width 3.5 mm. Sclerites brown, with distinct punctate pattern. Head: Head ( Figs. 1 d–1f) 4.5 mm, width 1.4 mm, posteriorly slightly wider, dorsally moderately concave, and ventrally convex in lateral view; head ground color yellowish brown, with distinct punctate pattern throughout head surfaces, with light markings around eyes; setae brown, relatively long, thick. Frontoclypeus anterior margin moderately round. Labrum with yellow hairlike setae near anterior membranous margin. Mandibles brown, with apical teeth; left mandible with brush of setae in median depression. Mentum triangular, anteroposteriorly narrow; submentum yellow, with brown median process, with setae on anterior angles. Thorax: Thoracic nota cylindrical, oblong, yellowish brown, with distinct punctate pattern and broad black posterior margin, with few long setae, with fringe of short slender setae anteromarginally, with pronotal median suture. Prothoracic pleura brown; median part and posterior margin of epimeron surrounding coxa black. Prosternite with moderate black median part anteriorly, extending posteriorly at both sides ( Fig. 1 g). Forecoxae with two large dorsal conical processes ( Fig. 1 h); basal process 0.3 mm, with seta subapically; apical process 0.2 mm, curved downward. Legs nearly equal in length, yellowish brown; femur slightly broader apically, punctate; claws bifid, hooklike. Abdomen: Abdomen almost uniformly broad, greenish grey in live specimens, purple in alcohol, with scarce setae. Anal prolegs brown, stout, with few dark setae; claws hooklike.

Diagnosis. The male adult of S. angustata Martynov is similar to S. uncinata Navás but can be distinguished by longer intermediate appendages of segment X. The larva is similar to Stenopsyche sp. 2 in possessing distinctive punctate pattern of the head ( Figs. 1 d–1f) and median part of the posterior prosternite ( Fig. 1 g), but it has smaller dorsal processes the forecoxae ( Fig. 1 h).

Material examined. VIETNAM. Ha Giang Prov.: 5 larvae, Vi Xuyen, Tay Con Linh, 9 xii 2000, V.V. Nguyen; 4 larvae, Yen Minh, Du Gia, 30 iv 2000, V.V. Nguyen. Lao Cai Prov.: 1 male, Sapa, Thac Bac, alt. 2000 m, 22 iv 2002, Y.J. Bae, V.V. Nguyen & D.H. Hoang; 25 larvae, Sapa, Cat Cat, Suoi Vang Creek, 20 x & 28 xii 2000, V.V. Nguyen & T.K.T. Cao; 1 larva, Sapa, Cau May, 19 x 2000, V.V. Nguyen; 16 larvae, Sapa, Muong Hoa, 20 x 2000, V.V. Nguyen. Vinh Phuc Prov.: 12 males, 3 females & 26 larvae, Tam Dao National Park, Thac Bac, alt. 200–700 m, 16 x 2000 & 16 iv 2002, D.H. Hoang & V.V. Nguyen. Thua Thien–Hue Prov.: 2 larvae, Hong Thuy, A Luoi, 9 i 2002, D. N. Cuong.

Distribution. Southwestern China, Northern and Central Vietnam (Ha Giang Prov., Lao Cai Prov., Vinh Phuc Prov., Thua Thien–Hue Prov.).

Remarks. We collected a number of adult and larval specimens of this species from northern and central Vietnam including Lao Cai Province. This is a common species of Stenopsyche in northern and central Vietnam.

Figures

FIGURE 1. Stenopsyche angustata Martynov. a – c: female genitalia. a: dorsal; b: lateral; c: ventral. d – h: full-grown larva. d: dorsal head; e: lateral head; f: ventral head; g: ventral prothorax. h: processes of right forecoxa.