Himalopsyche immodesta, 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 : 426-430

Himalopsyche immodesta sp. nov.

Figures 4 A–4E

Material examined. Holotype. 1 male: China, Yunnan, Dali Bai Autonomous Prefecture, small stream 5 km NW of Fengyu town, 26°1.31’N, 99°53.28’E, ca 2730 m asl; leg. Chen, Hjalmarsson, Li , 23.vii.2013. Deposited in Senckenberg Research Institute , Frankfurt am Main , Germany. BOLD Process ID SPHIM411-17 , Field ID AH0685, Museum ID SMFTRI00017218.

Additional material. 33 larvae: Yunnan, China: 27°37.95’N, 99°22.09’E (28 larvae); 26°19.38’N, 99°15’E (3 larvae); 26°19.49’N, 99°16.67’E (2 larvae). Deposited in Senckenberg Research Institute , Frankfurt am Main, Germany ( Table S1 ) .

Diagnosis. The holotype of the new species is most similar to the male of H. viteceki , but (1) the mesodorsal lobe of each superior appendage has a ventral triangular protrusion in lateral view (absent in H. viteceki ); (2) the distal segment of each inferior appendage is 1/3 as long as the proximal segment and the tip of the distal segment is curved mesad at a right angle, projecting distinctly mesodorsad (the distal segment is half as long as the proximal segment and the tip of the distal segment is subrhombic, projecting mesodorsad in an oblique angle in H. viteceki ); (3) lateral lobes of superior appendages laterally convex in dorsal/ventral views and with clear caudal incision between the mesodorsal and lateral lobes in dorsal/ventral views (the lateral lobes of the superior appendages are straight, bending slightly inward in dorsal/ventral views and without caudal incisions between the mesodorsal and lateral lobes in dorsal/ventral views in H. viteceki ).

Description. Adults. Habitus (in alcohol) brown; sternites beige, tergites brown; legs beige with dark stripes. Wings with brown pattern and dark setae on veins. Male maxillary palps each 5-segmented, spur formula 3-4-4. Length of each forewing in males 19–21 mm.

Male genitalia ( Figures 4 A–4E). Segment IX dorsally longer than ventrally and seemingly fused with tergum X; in dorsal view anteriorly concave, lateral margins convex, caudally concave with small dorsomesal process projecting caudad ( Figure 4D ); in lateral view dorsal margin slightly convex, caudal margin with dorsal portion straight, slightly oblique, ventral portion irregularly deeply incised (2/3 of segment length) at insertions of inferior appendages ( Figure 4A ); in ventral view anteriorly straight, caudally convex ( Figure 4E ). Tergite X forming two parallel ridges projecting in oblique angle dorsad from segment IX, tapering towards apices and fused with anal sclerites apically, in dorsal view elongate subtriangular; in lateral view dorsal margin convex and ventral margin joined with a membranous structure ( Figures 4A, 4D ). Anal sclerites fused mesally ( Figure 4D ); in lateral view with basal portion straight, tip hooked ventrad ( Figure 4A ). Superior appendages each complex, planar, indistinctly bilobed and approximately as long as inferior appendages; mesodorsal lobe in lateral view evenly curved and projecting caudoventrad with oval tip and large ventral triangular protrusion ( Figure 4A ), in dorsal view digitiform and fused with lateral lobe ( Figure 4D ); lateral lobe foliaceous, large, in lateral view dorsal margin fused with mesodorsal lobe, dorsocaudal margin unevenly convex, ventrocaudal margin concave, ventral margin with protrusion in caudal half ( Figure 4A ), in dorsal and ventral views lateral margins convex, with clear caudal incision between mesodorsal and lateral lobes and with irregularly rounded mesal intrusion ( Figures 4D, 4E ). Inferior appendages each 2-segmented: Basal segment bilobed, mesodorsal lobe acute with subterminal caudoventral indentation; lateroventral lobe digitiform, distally slightly dilating; distal segment 1/3 as long as proximal segment and with subrectangular tip projecting distinctly mesodorsad in right angle, with fine dense thorns on mesal face ( Figures 4A, 4E ). Aedeagus positioned on left side of paramere; in lateral view irregularly sinuate, wider at base; in ventral view projecting laterocaudad, with oval opening ( Figures 4B, 4C ). Paramere spiniform, shorter and thinner than aedeagus, in ventral view projecting laterocaudad ( Figures 4B, 4C ).

Etymology. The name refers to the ornate and ostentaceous (immodest) shape of the male genitalia.

Distribution. China (Yunnan; Figure 8A ).

Figures

FIGURE 4. Male genitalia of Himalopsyche immodesta sp. n. 4A, left lateral; 4B, phallic apparatus, left lateral; 4C, phallic apparatus, ventral; 4D, dorsal; 4E, ventral.Abbreviations: IX = abdominal segment IX; X = tergum X; a.s. = anal sclerite; s.a. = superior appendages; i.a. = inferior appendages; a. = aedeagus; p. = paramere.

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.