Nemophora triuga Sun, Wang et Li, 2022

Sun, Hao, Wang, Shuxia & Li, Houhun, 2022, Review of the degeerella species group of the genus Nemophora Hoffmannsegg 1798 (Lepidoptera: Adelidae) from China, Zootaxa 5219 (4), pp. 301-338 : 333

Nemophora triuga Sun, Wang et Li , sp. nov.

( Figs 26 , 47 )

urn:lsid:zoobank.org:act:0AA1726A-57E4-43B5-A8B6-91C50C987BB6

Type material. CHINA, Tibet: Holotype ♂, Zhangmu Town , Nielamu County, 1961 m, 8.VII.2019, leg. MJ Qi & JQ Deng, slide No. SH 19116 . Paratype: 1♂, same data as holotype .

Diagnosis. The new species can be distinguished from its congeners by the distally digitate valva with three longitudinal ridges on the ventral surface, the sacculus sclerotized medially, and the elongate ovoid vinculum.

Description. Adult ( Fig. 26 ). Male wingspan 18.0−19.0 mm.

Head: Vertex pale yellow; frons pale yellow. Eye interocular index 0.57−0.64. Proboscis dark brown. Labial palpus yellow, 1.4−1.7 × vertical eye diameter. Antenna 4.0−4.4 × length of forewing; scape dark brown; flagellum yellowish brown.

Thorax: Mesonotum golden yellow; tegula bronzy except purplish blue distally. Forewing ground color dark yellowish brown, with purplish bronzy spot at base of cell; two purple bands edged with black scales, with metallic luster: first band from base to beyond 2/5 along costal margin, second band from base to 4/5 of cell along posterior margin; seven black streaks: first streak from base to 1/4 of wing, between Sc and R 1, second streak from base to 2/5 of wing along R 1, third streak from base to 3/4 of cell along anterior margin, fourth streak from basal 2/5 to 2/3 of cell, fifth streak from near base to 2/5 of wing along CuP, sixth streak from base to near middle of wing along 1A+2A, with purple scales inside in distal 2/5, seventh streak from base to middle along dorsum; inner and outer fasciae purplish gray, inner fascia straight, outer fascia curved inward, medial fascia pale yellow, widened anteriorly, edged with black scales; black stripes from beyond outer fascia to apex along veins; fringe dark brown. Hindwing and fringe grayish brown. Foreleg with coxa and femur yellow ventrally, dark brown with bluish purple luster dorsally, tibia dark bluish brown, tarsus brown; midleg with femur yellow ventrally, purplish bronzy dorsally, tibia bluish brown, tarsus yellow ventrally, purple dorsally; hindleg with femur yellow, tibia yellow except brown in distal 1/3, tarsus bronzy. Epiphysis dark brown, at middle of tibia, reaching near apex of tibia.

Abdomen: Yellow on ventral surface, bronzy on dorsal surface.

Male genitalia ( Fig. 47 ). Socius ovoid, length 1.64 × width. Tegumen with distinct median ridge. Uncus deeply concave anteromedially, pointed posteriorly. Valva separated basally, digitate distally, concave medially on costal margin; with three longitudinal ridges on ventral surface: first ridge from beyond basal 1/4 to near 3/4 of ventral margin of sacculus, second ridge from base to basal 3/4 of ventral margin of sacculus, third ridge from base to near apex of valva; sacculus broad, 0.87 × length of valva, sclerotized medially. Transtilla with a large semicircular anterior emargination; median process spiniform, reaching posterior 2/5 of tegumen apically. Vinculum 3.6 × length of valva; elongate ovoid, broadly rounded anteriorly. Phallus 1.2 × length of vinculum, with spines from distal 1/4 to 1/6, sclerotized belt from distal 1/6 to near apex, club-shaped process at distal 1/5 and long process from distal 1/6 to 1/10; vesica elliptical ( Fig. 47a ). Juxta 0.58 × length of phallus; lateral arm of arrow head 0.15 × length of arrow head.

Female unknown.

Distribution. China (Tibet).

Etymology. The specific epithet is derived from the Latin tri - and iugum, referring to the valva with three longitudinal ridges.

Figures

FIGURES 23‒26. Adults of Nemophora spp. 23, N. spinatibaltea sp. nov., holotype, ♂; 24, N. staudingerella, ♂; 25, N. staudingerella, ♀; 26, N. triuga sp. nov., holotype, ♂. Scales= 5.0 mm.

FIGURES 44‒47. Male genitalia of Nemophora spp. 44, N. seorsifascia sp. nov., holotype, slide No. SH20188; 45, N. spinatibaltea sp. nov., holotype, slide No. SH19158; 46, N. staudingerella, slide No. SH20138; 47, N. triuga sp. nov., holotype, slide No. SH19116; 44−47a, enlarged distal part of phallus. Scales= 0.2 mm, 44a‒47a= 0.1 mm.