Periacma laterispinulosa Wang, 2024

Wang, Shuxia & Xu, Zhixin, 2024, Taxonomy of the genus Periacma Meyrick (Lepidoptera: Autostichidae) from China, with a checklist of the world species, Zootaxa 5399 (2), pp. 101-129 : 110-112

Periacma laterispinulosa Wang , sp. nov.

( Figs 8 , 24 , 38 )

Type material. CHINA, Hainan: Holotype ♂, Wuzhishan (18°54′N, 109°40′E), 738 m, 3.III.2016, leg. QY Wang et al., slide No. XZX20576 . Paratypes: Hainan: 9♂ 1♀, same data as holotype except dated 2‒3.III.2016, slide Nos. XZX20577♂, XZX20832 ♀; 1♂, Mt. Yinggeling , 620 m, 14.IV.2010, leg. BB Hu & J Zhang, slide No. LiSR16139; 2♂, Hongxin Village , Yuanmen Town , 430 m, 17.IV.2014, leg. TT Liu et al., slide Nos. LiSR16152, HS15023; 3♂, Hongkan , Mt. Yinggeling , 540 m, 27.VII.2015, leg. QY Wang et al., slide No. LiSR16050; 2♂ 1♀, Hongkan , Mt. Yinggeling , 540 m, 15.III.2016, leg. QY Wang et al., slide Nos. XZX20585♂, ZXJ18408 ♀; 2♂, Hongxin Village , Yuanmen Town , Baisha County, 445 m, 22.III.2016, leg. QY Wang et al., slide Nos. XZX20832, XZX20572; 1♂ 1♀, Limushan, 607 m, 17.VII.2016, leg. X Bai et al., slide No. XZX20566♂; 1♀, Limushan, 607 m, 24.X.2016, leg. X Bai et al.; 1♂ 2♀, Yinggezui, Mt. Yinggeling , 599 m, 29‒31.VII.2017, leg. X Bai et al., slide Nos. ZXJ18100♂, ZXJ18472 ♀; 1♂, Yinggezui, Mt. Yinggeling , 623 m, 4.I.2018, leg. MJ Qi & S Yu, slide No. ZXJ18202.

Diagnosis. The new species is similar to P. siamensis Moriuti, Saito & Lewvanich, 1985 in male genitalia. It can be distinguished by the dorso-proximal process of the valva inflated distally and the sacculus with a thorn near the apex on the dorsal margin. In P. siamensis , the clavate dorso-proximal process is not inflated, and the sacculus lacks a thorn on the dorsal margin.

Description. Adult ( Fig. 8 ). Wingspan 13.5 ‒ 17.5 mm.

Head. Vertex and frons yellow, mixed with a few dark brown scales. Labial palpus yellow, first segment with dense black scales on outer surface; in male second segment with some brown scales; in female second and third segments with black scales on outer surface, with a few brown scales near apex on inner surface. Antenna with scape yellow on ventral surface, black on dorsal surface; flagellum yellow and black on dorsal surface, yellow and yellowish brown on ventral surface.

Thorax. Mesonotum deep yellow, black at apex, with black scales at middle; tegula deep yellow, mixed with yellowish brown or brown scales. Forewing deep orange yellow, with black scales; costal margin with a black spot at base; dorsum with a large dark brown speckle at base, extending obliquely outward to fold, then along above fold to before 2/5 of fold; discal and plical spots black; postmedial fascia black, from before costal 3/5 to tornus; apical fascia black, not reaching postmedial fascia; fringe deep yellow, mottled with black scales, blackish grey around tornus. Hindwing grey; fringe grey, mottled with yellow. Legs yellow, except three distal tarsomeres of fore- and midlegs black; on ventral surface, foreleg with a few black scales on coxa; on dorsal surface, foreleg with dense black scales on femur, tibia with a black stripe, tarsus with few black scales at middle of first tarsomere, midleg with dense black scales at base of femur, tibia black at base, with black scales on distal half, tarsus black at middle of first tarsomere and at base of second tarsomere; on outer surface, hindleg with grey scales on tibia, tarsus black at base of each tarsomere.

Male genitalia ( Fig. 24 ). Uncus narrow and parallel sided from base to basal 1/4, distal 3/4 gradually expanded to obtuse apex, with long setae near base laterally. Gnathos with basal arm gradually widened, as long as ventral plate; ventral plate widened, transversely extended and narrowed to pointed lateral end, with dense short spines near anterior margin. Valva with costal part narrow and parallel sided from base to basal 1/3, distal 2/3 wider and parallel sided, apex obtusely rounded; costa straight; dorso-proximal process inflated distally, setose; sacculus slightly shorter than 2/5 length of costal part of valva, narrowed from broad base to basal 3/4, distal 1/4 nearly uniformly wide, apex obtuse, dorsal margin with a thorn at distal 1/4, produced to a sub-quadrate distal process. Saccus short and wide, obtusely rounded on anterior margin. Aedeagus slightly longer than 2/3 length of costal part of valva, basal 1/2 narrow, claviform; distal 1/2 wider, hollow, with s stout thorn and several short thorns on one side, produced to a curved distal process directed sideway.

Female genitalia ( Fig. 38 ). Papilla anale broad, apex obtusely rounded. Apophysis anterioris about 1/3 length of apophysis posterioris. Eighth sternal plate with eyebrow-shaped process bearing long setae laterally near posterior margin. Lamella antevaginalis sub-rectangular, with heavily sclerotized narrow band along posterior and lateral margins, anterolaterally extending outward and forming a broad band joining with anterior corner of eighth sternal plate. Ductus bursae membranous, with dense granules posteriorly. Corpus bursae membranous, sub-spherical; signum elongate narrow, with dense thorns, apical thorn longest.

Distribution. China (Hainan).

Etymology. The specific epithet is derived from the Latin later- and spinulosus, referring to the aedeagus with several short thorns on one side distally.

Figures

FIGURES 1‒9. Adults of Periacma spp. 1. P. acriuncata; 2. P. anterosinuata sp. nov., holotype; 3. P. falcata sp. nov., holotype; 4. P. ferialis; 5. P. himalayensis; 6. P. kunai; 7. P. largiloba sp. nov., holotype; 8. P. laterispinulosa sp. nov., holotype; 9. P. lianzhouensis, comb. nov. Scales = 2.0 mm.

FIGURES 19–24. Male genitalia of Periacma spp. 19. P. anterosinuata sp. nov., slide No. XZX20611, holotype; 20. P. falcata sp. nov., holotype, slide No. XZX20831; 21. P. ferialis, slide No. LiSR16106; 22. P. himalayensis, slide No. XZX767; 23. P. largiloba sp. nov., holotype, slide No. LiSR16109; 24. P. laterispinulosa sp. nov., holotype, slide No. XZX20576. Scales = 0.2 mm.

FIGURES 33‒38. Female genitalia of Periacma spp. 33. P. acriuncata, slide No. XZX20717; 34. P. anterosinuata sp. nov., paratype, slide No. XZX20612; 35. P. ferialis, slide No. XZX20850; 36. P. himalayensis, slide No. XZX20768; 37. P. kunai, slide No. XZX20814; 38. P. laterispinulosa sp. nov., paratype, slide No. ZXJ18472. Scales = 0.5 mm.