Nemophora longissima, Sun & Li, 2023

Sun, Hao & Li, Houhun, 2023, Taxonomy of the mediseorsa species group of the genus Nemophora Hoffmannsegg 1798 (Lepidoptera: Adelidae), Zootaxa 5258 (4), pp. 485-494 : 488-489

Nemophora longissima sp. nov.

( Figs 4, 5 , 9 , 12 )

urn:lsid:zoobank.org:act:2D9A924D-F1A6-43C7-AA2F-44B38C0B8991

Type material. CHINA, Sichuan: Holotype ♁, Baliping, Anzihe, Chengdu , 1706 m, 17.VI.2016, leg. KJ Teng & XF Yang, slide SH20248 . Paratypes: 1 ♁, same data as holotype; 1 ♁, 1 ♀, Shaoyaogou, Anzihe, Chengdu , 1598 m, 21−22.VI.2016, leg. KJ Teng & XF Yang, slide Nos. SH 20246♁, SH20247 ♀; 2 ♁, Wolong, Wenchuan, 1889 m, 13‒14.VII.2021, leg. S Yu, XJ Zhu & D Zhang, slide No. SH 20336 .

Diagnosis. The new species can be distinguished from its congeners by the relatively elongate vinculum 4.3 × the length of the valva, which is not longer than 2.5 × the length of the valva in other species. It is similar to N. mediseorsa sp. nov., and can be distinguished by the forewing without a purplish bronzy band, and the uncus with a papillary posteromedial process in the male genitalia. In N. mediseorsa , the forewing has a purplish bronzy band from base to basal 2/5 along the posterior margin of the cell, and the uncus lacks a posteromedial process.

Description. Adult ( Figs 4, 5 ). Male wingspan 12.5‒13.5 mm.

Head: Vertex yellow; frons purplish bronzy. Eye interocular index 0.50‒0.52. Proboscis brown. Labial palpus 0.71‒0.76 × vertical eye diameter; black. Antenna 3.1−3.8 × length of forewing; scape golden yellow ventrally, purplish bronzy dorsally; flagellum grayish brown except basal 1/5 dark yellowish brown.

Thorax: Mesonotum bronzy yellow; tegula purplish bronzy. Forewing ground color brownish yellow except distal 1/6 yellowish bronzy; black speckle from near base to basal 2/5 between costal margin and above posterior margin of cell; two black streaks below black speckle: first streak to beyond basal 1/3 along posterior margin of cell, second streak to basal 1/5 along dorsum; inner and outer fasciae silvery gray, with purplish blue luster, edged with dark brown scales: inner fascia straight or slightly curved outward, outer fascia curved inward, separated by brownish yellow scales medially; medial fascia yellow, narrowed medially; black speckle between costal margin and R 5 beyond outer fascia; five black streaks from outer fascia extending to distal 1/6 between R 5 and termen; fringe grayish brown. Hindwing grayish brown; fringe pale gray. Foreleg silvery yellow except tibia purplish bronzy dorsally; midleg silvery yellow except tibia brownish yellow dorsally; hindleg silvery. Epiphysis silvery, at distal 1/3 of tibia, reaching apex of tibia.

Abdomen: Silvery gray ventrally, dark brown dorsally.

Female wingspan 11.5 mm. Antenna 0.75 × length of forewing, yellowish brown. Otherwise, similar to male.

Male genitalia ( Fig. 9 ). Socius elongate elliptical, length 2.1 × width. Uncus maximum width about 2.8 times length, with papillary process posteromedially. Tegumen without median ridge. Valva fused for basal 2/5, gradually narrowed to rounded apex, slightly concave medially on costal margin; sacculus reaching near apex of valva, setose distally. Transtilla slightly concave medially on anterior margin; median process spiniform, reaching middle of tegumen apically. Vinculum elongate, 4.3 × length of valva, narrowed to obtusely rounded anteriority ( Fig. 9b ). Phallus 1.1 × length of vinculum, with two belts of spines in distal 1/4; vesica with teeth ( Fig. 9a ). Juxta 0.58 × length of phallus; lateral arm 0.12 × length of arrow head.

Female genitalia ( Fig. 12 ). Apophyses posteriores slightly longer than apophyses anteriores; apophyses anteriores fused with eighth tergum in posterior 2/5, 2.4 × length of seventh tergum. Eighth tergum triangularly produced anteromedially. Seventh tergum pointed posteriorly. Vestibulum membranous, with two sclerites: one from basal 1/4 to 3/5, another from distal 1/3 to near apex, swollen in distal 1/3. Ductus bursae 0.45 × length of vestibulum, 0.82 × length of corpus bursae. Corpus bursae ovoid.

Distribution. China (Sichuan).

Etymology. The specific epithet is derived from the Latin longissimus, referring to the relatively elongate vinculum of the male genitalia.

Figures

FIGURES 1‒6. Adults of Nemophora spp. 1, N. mediangusa sp. nov., holotype, ♁; 2, N. longiuga sp. nov., holotype, ♁; 3, N. longiuga sp. nov., paratype, ♀; 4, N. longissima sp. nov., holotype, ♁; 5, N. longissima sp. nov., paratype, ♀; 6, N. mediseorsa sp. nov., holotype, ♁. Scales = 5.0 mm.

FIGURES 7‒10. Male genitalia of Nemophora spp. 7, N. mediangusa sp. nov., slide No. SH19105; 8, N. longiuga sp. nov., slide No. SH20255; 9, N. longissima sp. nov., slide No. SH20248; 10, N. mediseorsa sp. nov., slide No. SH20197.All holotypes. 7a‒10a, enlarged distal part of phallus. 9b, transtilla, slide No. SH20336. Scales = 0.2 mm, 7a‒10a = 0.1 mm, 9b = 0.2 mm.

FIGURES 11‒12. Female genitalia of Nemophora spp. 11, N. longiuga sp. nov., paratype, slide No. SH20187; 12, N. longissima sp. nov., paratype, slide No. SH20247. Scales = 0.2 mm.