Stenopsyche ulmeri Navás 1932

Hoang, Duc Huy & Bae, Yeon Jae, 2007, Vietnamese species of Stenopsyche McLachlan (Trichoptera: Stenopsychidae), Zootaxa 1624, pp. 1-15 : 9-11

Stenopsyche ulmeri Navás 1932 ( Figs. 5 a– 5g, 6a–6e)

Stenopsyche ulmeri Navás 1932: 937 (male; Sapa, Lao Cai Prov., Vietnam); Mey 1995: 209 (male & female distributional records; Tam Dao NP, Vinh Phuc Prov., Vietnam).

Male. Body 17 mm; forewings 25–27 mm; antennae 33–34 mm. Thorax strongly setose. Spur formula 3. 4. 4. Hwang (1963: 483, 489) described the male adult of this species, but we herein illustrate the male genitalia.

Female. Body 20 mm; forewings 27–29 mm. Head: Antennae 32 mm, dark brown. Female genitalia ( Figs. 5 e– 5g): Segment VIII with setose sternite. Segment IX and X fused; segment IX sclerotized, dark brown; segment X membranous, brown with posterolateral corners forming small setose semisclerotized lobes. Gonopore with pair of hairy vulvar scales. Segment XI with two pairs of lobes: posteroventral lobes membranous, narrow basally, with tiny cerci apically; dorsolateral lobes semisclerotized, small, setose, closely located to median line of dorsum.

Larva. Body 48 mm, width 4 mm. Sclerites brown, with distinct punctate pattern. Head: Head ( Figs. 6 a– 6c) 4.6 mm, width 1.9 mm, posteriorly somewhat wider, dorsally slightly concave ventrally convex in lateral view; ground color brown, with distinct punctate pattern throughput head surfaces, with light markings around eyes; setae relatively long, moderately thick, brown. Frontoclypeus anterior margin moderately round.

Labrum with yellow hair near anterior membranous margin. Mandibles brown, with apical teeth; left mandible with brush of setae in median depression. Mentum slightly oblong; submentum brown, with setae on anterior angles. Thorax: Thoracic nota cylindrical, oblong, brown, with distinct punctate pattern and broad black posterior margin, with median suture, with few long setae, with fringe of short slender setae on anterior margin. Prothoracic pleuron brown; epimeron surrounding coxa with black median part, median stripe, and posterior margin. Posterior prosternite ( Fig. 6 e) anteroposteriorly with narrow black median part extending posteriorly at both sides. Forecoxae with two dorsal conical processes; basal process rudimentary, with long seta; apical process straight, 1.0 mm ( Fig. 6 d). Legs nearly equal in length, brown; femora slightly broader apically, punctate; claws bifid, hooklike. Abdomen: Abdomen almost uniformly broad, 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 this species can be distinguished from other species of Stenopsyche by the shape of the abdominal segment X, inferior appendages, and superior arms as in the following descriptions and illustrations ( Figs. 5 a–5d). The larva of this species is similar to Stenopsyche sp. 1 in the distinctive punctate pattern in head ( Figs. 6 a–6c), but it can be distinguished by the shape of the dorsal processes of forecoxae ( Fig. 6 d) and median part of posterior prosternite ( Fig. 6 e). The larva of S. ulmeri is the largest in body size among the species of Vietnamese Stenopsyche .

Material examined. Lao Cai Prov.: 3 males, 6 females & 3 larvae, Sapa, Thac Bac, alt. 2000 m, 20 x 2000, 28 xii 2000, & 22 iv 2002, T.K.T. Cao, Y.J. Bae, V.V. Nguyen & D.H. Hoang.

Distribution. Northern Vietnam (Lao Cai Prov., Vinh Phuc Prov.).

Remarks. Stenopsyche ulmeri Navás (1932) and S. appendiculata Hwang (1963) (originally described from Yunnan Province in China) belong to the apiguna -group and they are probably conspecific based on the descriptions and distributions.

Figures

FIGURE 5. Stenopsyche ulmeri Navás. a – d: male genitalia. a: dorsal; b: lateral; c: ventral; d: superior arms in caudal view. e – g: female genitalia. e: dorsal; f: lateral; g: ventral.

FIGURE 6. Stenopsyche ulmeri Navás. a – e: full-grown larva. a: dorsal head; b: lateral head; c: ventral head; d: ventral prothorax; e: processes of right forecoxa.