Stenopsyche huangshanensis, Ji-Hua, Xu, Chang-Hai, Sun & Bei-Xin, Wang, 2015

Ji-Hua, Xu, Chang-Hai, Sun & Bei-Xin, Wang, 2015, A new species of Stenopsyche, with descriptions of larvae and females of some species associated by gene sequences (Insecta: Trichoptera), Zootaxa 4057 (1), pp. 63-78 : 66-69

Stenopsyche huangshanensis sp. nov.

( Figs. 2–4 )

Male. Body 22 mm. Length of each forewing 24 mm (n=1). Forewings light brown, each with many irregular light speckles in anterior part, and many long speckles in posterior part. Hind wings triangular and semi-transparent. Male genitalia: Abdominal segment IX annular; in lateral view ventral 1/3rd of pleuron IX strongly produced anterad and posterad with ventral margin long and dorsal margin short (transversely narrow in dorsal view), acute and curved anterad in lateral view; apicolateral angles digitate and curved slightly upward in lateral view, about half as long as preanal appendages. Preanal appendages elongate, setose, slightly sinuate and curved mesad in dorsal view. Segment X in dorsal view about 2/5ths as long as preanal appendages, each lateral margin with incision near base, pair of subtriangular projections at mid-length with pair of small, barely noticeable, bristled processes on their posterior edges, apex with pair of divergent projections separated by concavity. Intermediate appendage small, button-like in dorsal view. Superior arms long, highly sclerotized, 3/5ths as long as preanal appendages, each with its distal 1/3rd curved outward in dorsal view and with apex obtuse; in lateral view distal 1/ 3rd curved downward. Inferior appendages subrectangular, about 3.6 times as long as wide and each with apex oblique in ventral view, longer mesally. Phallus with endothecal armature bearing many fine spines.

Female. Length of each forewing 25 mm (n=1). Body yellowish brown. Female genitalia: Segment VIII in lateral view with sternum trapezoidal, setose ventrally and tergum oblique, trapezoidal; in dorsal view tergum subrectangular and in ventral view sternum with anterior margin slightly incised posteriorly and posterior margin bilobate. Segment IX sclerotized laterally, subrectangular in lateral view, membranous dorsally and ventrally, with transverse dorsal fold and with lateral apodemes extending internally anterad. Vulvar scale located ventrally, semicircular in lateral view, with posterolateral angle strongly setose; in ventral view with distal margin sinuate. Segment X membranous, with pair of setose longitudinal sclerites dorsolaterally oblong in dorsal view and barshaped in lateral view, another pair of setose longitudinal sclerites ventrolaterally about as long as dorsolateral sclerites; apex divided into pair of distal setose lobes, each bearing cercus. Cerci small, nipple-like. Processus spermathecae in lateral view irregular, posterior margin produced into small process.

Larva (5th instar). Body length 45 mm. Head and pronotum strongly sclerotized. Head: 6 mm long and 3 mm wide (n=2), in dorsal view subrectangular with basal and distal margins rounded. Ground color yellowish brown, with dark spots scattered over the whole head capsule, some of them connected to form short stripes. Eyes black, eye areas small, pale. Labrum stramineous, with pair of hair brushes at rounded anterior margin in dorsal view.

Clypeus yellow, but yellowish brown along anterior margin. Frontoclypeal apotome yellowish brown, with sparse dark dots and dark stripes. Mandibles dark brown, each with 4 apical teeth, only left mandible with mesal brush of stiff hairs. Mentum semicircular, posterior margin straight, apical margin with small tongue-shaped mesal process, each posterolateral angle with bristle. Anterior ventral apotome triangular, as broad as mentum, about 1/13th as long as ventral ecdysial line. Pair of #18 setae near posteroventral margin located posterior to base of ventral ecdysial line; distance from each seta to posteroventral margin shorter than distance of that seta to ventral ecdysial line (d1:d2 = 1:1.6).

Thorax: Pronotum heavily sclerotized, subrectangular in dorsal view, rounded ventrolaterally in lateral view, yellowish brown, dark spots on each side and in basal half near dorsal meson, large triangular dark spot located laterally just above episternum, anterior margin with scattered fine hairs and few bristles. Foretrochantin on each side in lateral view rhomboidal; episternum small, triangular; epimeron surrounding posterior base of coxa, in ventral view rectangular, with its anterior margin concave. Prosternum fused with pronotum, with inverted Tshaped black spot. Forelegs each with forecoxa short, cylindrical, in lateral view upper margin with 2 acute processes, basal process straight and with strong bristle at middle, distal process curved downwards; foretrochanter 2-jointed, basal joint short, distal one triangular; forefemur cylindrical, distal end thicker than base, with longitudinal carina from base to apex on outer side and longitudinal indentation on inner side; tibia slender, shorter than femur; tarsus slender, shorter than tibia, with row of hairs on inner side along lower margin; claw curved downward with small finger-like ventral process. Meso- and metanota membranous. Mesonotal setae arising in setal areas sa 1, sa 2, and sa 3, each setal area with 1 seta. Mid- and hind legs nearly equal in length, same color patterns as foreleg, but coxae without teeth, each claw with small ventral process.

Abdomen: Almost uniformly broad, greenish grey in live specimens, brownish in alcohol, with scarce setae. Anal prolegs brown, stout, with few dark setae; claws hook-like.

Holotype male. CHINA, An-hui Province, Huang-shan County, Tang-kou Town, Fu-xi, 30°04′42″N, 118°09′00″E, alt. 614.3 m, 10 July 2013, by black light trap, Xu Ji-hua, Nie Chen-rui & Chen Dong-kai. Paratypes: Same data as holotype except alt. 639.0 m, 12 July 2013, 1 female, 3 larvae.

Diagnosis. The male genitalia of this new species are similar to those of S. triangularis Schmid 1959 from Shaan-xi, China, but differ from the latter in that (1) segment X has 2 pairs of processes (1 pair of processes in S. triangularis ); (2) the superior arms are curved outward at an angle of 120° at 1/2 of the distance from the apex (the superior arms are curved outward at an angle of 80° at 1/3rd of the distance from the apex in S. triangularis ). The female of the new species is similar to that of S. angustata in the genitalia, but differs from it in that (1) segments IX and X are visually separated by a fold (completely fused without a fold in S. angustata ); (2) the dorsolateral sclerites of segment X are about as long as the ventrolateral sclerites (the dorsolateral sclerites are longer than the ventrolateral sclerites in S. angustata ); and (3) the processus spermathecae in lateral view has its posterior margin produced into a small process (the lower margin has a wide incision in S. angustata ). The larva can be diagnosed from larvae of other Stenopsyche species by the distinctive punctate color pattern of the head, the curved distal process of each forecoxa, and the locations of the pair of #18 setae.

Etymology. The specific epithet is from the Chinese name of the type locality, Huang-shan County, An-hui Province.

Distributions. China (An-hui).

Figures

FIGURE 2. Stenopsyche huangshanensis sp. nov., male genitalia. 2 A, left lateral; 2 B, dorsal; 2 C, ventral; 2 D, phallus, left lateral.

FIGURE 3. Stenopsyche huangshanensis sp. nov., female genitalia. 3 A, left lateral; 3 B, dorsal; 3 C, ventral. ap. IX = lateral apodeme of segment IX; c. = cercus; pr. sp. = processus spermathcae; seg. IX = segment IX; seg. X = segment X; st. VIII = sternum VIII; t. VIII = tergum VIII; vul. sc. = vulvar scale.

FIGURE 4. Stenopsyche huangshanensis sp. nov., larva. 4 A – G, head: 4 A, dorsal; 4 B, left lateral; 4 C, ventral; 4 D, labrum and clypeus, dorsal; 4 E, mandibles, mentum, and anterior ventral apotome, ventral; 4 F, left mandible, ventral; 4 G, pair of # 18 setae, posteroventral. 4 H – I, prothorax: 4 H, dorsal; 4 I, left lateral. 4 J – L, foreleg and propleuron: 4 J, left foretrochantin, episternum, and epimeron, left lateroventral; 4 K, left forecoxa, left lateral; 4 L, right tarsus and claw, right lateral.