Nemophora digitivalva 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 : 312

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

( Figs 10 , 34 )

urn:lsid:zoobank.org:act:D4D5CF37-1F37-4D17-AE44-1388B62D9819

Type material. CHINA, Shaanxi: Holotype ♂, Huanglong County, 15.VI.1959, leg. LC Xiang & N Ma, slide No. SH 20019 . Paratype: Ningxia: 1♂, Hongxia Farm, Mt. Liupan , 2600 m, 22.VI.2008, leg. SL Hao & ZW Zhang, slide No. SH 20035 .

Diagnosis. The new species can be distinguished from its congeners in the male genitalia by having a digitate valva. It is similar to N. karafutonis ( Matsumura, 1932) in the tegumen without a median ridge, the valva separated basally and rounded at the apex, and the sacculus reaching near the apex of the ventral margin. Nemophora digitivalva can be distinguished by the tegumen without a plate, the triangular uncus, the spiniform median process of the transtilla, and the phallus without sclerotized belts. In N. karafutonis , the tegumen has a triangular plate extending from middle to posterior 1/3, the uncus is dome-shaped, the median process of the transtilla is triangular, and the phallus has a pair of sclerotized belts in distal 1/3.

Description. Adult ( Fig. 10 ). Male wingspan 22.0−23.0 mm.

Head: Vertex pale yellow; frons bronzy. Eye interocular index 0.43−0.45. Proboscis dark brown. Labial palpus 1.7−1.9 × vertical eye diameter; first and second palpomeres yellow on inner surface, brown on outer surface, with black hairs; third palpomere black. Antenna 3.7−4.0 × length of forewing; scape dark brown; flagellum grayish brown except dark brown in basal 1/4.

Thorax: Mesonotum golden yellow; tegula golden yellow except purplish bronzy distally. Forewing ground color dark yellowish brown, with brown streak from base to middle along costal margin, edged with black scales; two black lines: first line from near base to near posterior angle of cell, second line from near base to beyond 2/5 of wing along CuP; inner and outer fasciae grayish brown, inner fascia slightly curved outward medially, outer fascia curved inward, extending outward anteriorly and posteriorly, medial fascia orange yellow, oblique inward, widened posteriorly; eight brown stripes radiating from beyond outer fascia to apex along veins from R 2 to CuA 1 respectively, edged with black scales; fringe dark brown. Hindwing grayish brown except light brown between costal margin and Rs; fringe dark brown. Foreleg with coxa and femur yellow, tibia yellow ventrally, dark bluish brown dorsally, tarsus yellow ventrally, purplish bronzy dorsally; midleg with femur yellow, tibia yellow ventrally, bluish purple dorsally, tarsus yellow; hindleg yellow except tibia bronzy apically. Epiphysis dark brown, at basal 1/3 of tibia, not reaching apex of tibia.

Abdomen: Dark brown.

Male genitalia ( Fig. 34 ). Socius ovoid, length 1.5 × width. Tegumen without median ridge. Uncus triangular, slightly concave anteromedially. Valva digitate, separated basally, rounded apically, straight on costal margin, concave medially on ventral margin; sacculus reaching near apex of ventral margin, widened basally. Transtilla with a triangular anterior emargination, triangularly produced beyond concavity; median process spiniform, reaching posterior 2/5 of tegumen apically. Vinculum 2.0 × length of valva, rounded anteriorly. Phallus same length as vinculum, with spines from distal 1/5 to near apex ( Fig. 34a ). Juxta 0.68 × length of phallus; lateral arm 0.16 × length of arrow head.

Female unknown.

Distribution. China (Ningxia, Shaanxi).

Etymology. The specific epithet is derived from the Latin digit- and valva, referring to the shape of the valva.

Figures

FIGURES 7‒12. Adults of Nemophora spp. 7, N. borealis sp. nov., holotype, ♂; 8, N. chalybeella, ♂; 9, N. chalybeella, ♀; 10, N. digitivalva sp. nov., holotype, ♂; 11, N. gaoligongshana sp. nov., holotype, ♂; 12, N. gaoligongshana sp. nov., paratype, ♀. Scales= 5.0 mm.

FIGURES 33‒38. Male genitalia of Nemophora spp. 33, N.chalybeella, slide No. SH20179; 34, N.digitivalva sp. nov., holotype, slide No. SH20019; 35, N. gaoligongshana sp. nov., holotype, slide No. SH20184; 36, N. japonica, slide No. SH20193; 37, N. karafutonis, slide No. SH20203; 38, N. lapikella, slide No. SH20181; 33a − 38a, enlarged distal part of phallus. Scales= 0.2 mm, 33a‒38a= 0.1 mm.