Himalopsyche velata, Hjalmarsson, 2019

Hjalmarsson, Anna E., 2019, Delimitation and description of three new species of Himalopsyche (Trichoptera: Rhyacophilidae) from the Hengduan Mountains, China, Zootaxa 4638 (3), pp. 419-441 : 430-433

Himalopsyche velata s p. nov.

Figures 5 A–5E, 6A–6E

Material examined. Holotype. 1 male: China, Sichuan, Garzê Tibetan Autonomous Prefecture , small stream 4 km E of Dongmoyong village, 29°6.96’N, 100°1.96’E, ca. 4150 m asl; leg. Chen, Hjalmarsson, Li, 9.viii.2013. BOLD Process ID SPHIM193-17 , Field ID LZ05, Museum ID SMFTRI00018194.

Paratypes. 3 males, 1 female: Same data as holotype. Deposited in Senckenberg Research Institute , Frankfurt am Main , Germany (SMFTRI00017169, SMFTRI00017170, SMFTRI00017229) and Senckenberg Deutsches Entomologisches Institut, Müncheberg, Germany (SMFTRI00018193) .

Additional material. 36 larvae: Same data as holotype. Deposited in Senckenberg Research Institute, Frankfurt am Main, Germany ( Table S1 ) .

Diagnosis. Males of the new species are most similar to those of H. tibetana , but (1) the dorsal margin of segment IX in lateral view is straight and evenly extending to the dorsomesal process (distally elevated with a distinct notch between segment IX and the dorsomesal process in H. tibetana ); (2) the mesodorsal lobe of each superior appendage is sinuate and projecting dorsad (foliaceous, twisted, and projecting dorsocaudad in H. tibetana ); (3) the proximal segment of each inferior appendage is longer than the superior appendages (about as long as the superior appendages in H. tibetana ); (5) the distal segment of each inferior appendage has a distinct terminal indentation (with a shallow terminal indentation in H. tibetana ); and (6) the dorsomesal process has strongly sclerotized and blunt tips without hooks (sclerotized tips with a small hook in H. tibetana ). The female of the new species is most similar to those of H. maxima and H. tibetana but (1) segment VIII is without lateral sutures (segment VIII has lateral sutures in H. maxima ); (2) tergum IX is atrophied (tergum IX is present and triangular in H. tibetana ); (3) the caudal margin of segment VIII in lateral view has an incision in the ventral portion (caudal margin of segment VIII in lateral view extends triangularly in H. tibetana ).

Description. Adults. Habitus (in alcohol) light-brown; sternites beige, tergites brown; legs beige with dark stripes. Wings with light-brown pattern and dark setae on veins. Male maxillary palps each 5-segmented, spur formula 3-4-4. Length of each forewing in males 11–23 mm, in females 21–23 mm.

Male genitalia ( Figure 5 ). Segment IX dorsally longer than ventrally and dorsomesally fused with tergum X, forming distinct dorsomesal process projecting caudad and with membranous region spanning between dorsomesal process and superior appendages ( Figures 5A, 5D ); segment IX in dorsal view anteriorly somewhat broader than caudally, anteriorly slightly concave, lateral margins straight, caudally concave ( Figure 5D ); in lateral view dorsal margin straight, upper caudal margin oblique and nearly straight with blunt dorsomesal apex and evenly rounded incision in ventral third ( Figure 5A ); in ventral view anteriorly slightly convex and sinuous with shallow incision mesally, caudally convex ( Figure 5E ). Dorsomesal process as long as tergum IX, in dorsal view slightly compressed at mid-length and widening distally to subrhombic apex, with pair of strongly sclerotized tips ( Figure 5D ); in lateral view with upper margin straight, slightly dilated in middle, and blunt tip projecting ventrocaudad ( Figure 5A ). Superior appendages each distinctly bilobed: Mesodorsal lobe projecting dorsad, in lateral view with caudal margin sinuate, its base longer than suddenly narrower terminal portion ( Figure 5A ), in dorsal view subrectangular with terminal portion projecting mesad and with clear incision between dorsomesal and lateral lobes ( Figure 5D ); lateral lobes longer than dorsomesal process but shorter than inferior appendages, subtriangular, projecting caudad, each with anterodorsal portion fused with membrane spanning from tergum X ( Figure 5A ), in dorsal view with lateral margins convex ( Figure 5D ). Inferior appendages each 2-segmented: Proximal segment bilobed, mesodorsal lobe in lateral view oval with minute dorsocaudal protuberance; lateroventral lobe digitiform and slightly dilating towards apex and with a distal segment attached mesodorsally; distal segment 1/4 as long as proximal segment and with bilobed tip, dorsal lobe of tip longer than ventral lobe and covered in fine dense thorns on dorsomesal face ( Figures 5A, 5D, 5E ). Aedeagus placed on left side of paramere, in lateral view digitiform, curving slightly dorsad, with long ventral opening at apex, connected with paramere in curve; in ventral view broad at base, tapering mesally and dilating towards tip, with opening long and with small incision at apex ( Figure 5B, 5C ). Paramere spiniform, thinner and shorter than aedeagus ( Figure 5B, 5C ).

Female genitalia ( Figure 6 ). Segment VIII not divided into tergite and sternite, in dorsal view anteriorly broader than caudally, anterior margin slightly concave, lateral margins straight, oblique, caudal margin concave with mesal incision ( Figure 6D ); in lateral view higher anteriorly than caudally, dorsal margin slightly concave, dorsal portion of caudal margin straight, in the lower third incised and ventrally extending to a distinct digitiform ventromesal process covered with thick hairs projecting dorsocaudad and bearing a pair of finger-like ventromesal lobes covered in fine pubescent hairs, slightly bending and projecting caudad ( Figure 6A ); in ventral view anterior margin of segment VIII slightly convex, lateral margins straight and sweeping inward caudally, caudal margin with two distinct lateromesal incisions forming a triangular ventromesal process with two long and finger-like ventromesal lobes ( Figure 6E ). Tergum IX membranous and completely fused with tergum X. Tergum X membraneous with a dorsal fold and dorsal sclerites, dorsal lobes each bearing small cerci projecting caudad ( Figures 6A, 6D, 6E ). Apodemes jointed and connecting tergum X with segment VIII, extending anteriad ( Figures 6A, 6D ). Bursa copulatrix as pictured ( Figures 6B, 6C ).

Etymology. The word velum (sail) refers to the membraneous structure that is spanned, like a sail, between the dorsomesal process and the dorsomesal lobes of the superior appendages.

Distribution. Known from only the type locality ( Figure 8A ).

Figures

FIGURE 5. Male genitalia of Himalopsyche velata sp. n. 5A, left lateral; 5B, dorsal; 5C, ventral.Abbreviations:IX = abdominal segment IX; dm.p. = dorsomesal process; s.a. = superior appendages; i.a. = inferior appendages; a. = aedeagus; p. = paramere.

FIGURE 6. Female genitalia of Himalopsyche velata sp. n. 6A, left lateral; 6B, bursa copulatrix, dorsal; 6C, bursa copulatrix, left lateral; 6D, dorsal; 6E, ventral.Abbreviations: VIII = abdominal segment VIII; X = tergum X; b.c. = bursa copulatrix; vm.p. = ventromesal process of segment VIII.

FIGURE 8. Maps of Himalopsyche spp. localities. 8A, type localities of Himalopsyche viteceki sp. n., H. immodesta sp. n., and H. velata sp.n.; 8B, sampling localities of specimens belonging to the H. martynovi-Complex and H. epikur.