Periacma largiloba 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 : 109-110

Periacma largiloba Wang , sp. nov.

( Figs 7 , 23 )

Type material. CHINA, Yunnan: Holotype ♂, Jingpozhai (24º71′N, 97º39′E), Nabang Town , Yingjiang County, 231 m, 3.VIII.2013, leg. SR Liu et al., slide No. LiSR16109 . Paratype: 1♂, same data as holotype, slide No. LiSR16110 .

Diagnosis. The new species is similar to P. equivalvata Wang, Li & Liu, 2001 in male genitalia. It can be distinguished by the short digitate dorso-proximal process of the valva, the sacculus with two apical denticles, and the aedeagus with one distal process twice as long as the other process. In P. equivalvata , the dorso-proximal process of the valva is slenderly clavate, the sacculus lacks denticles at apex, and the aedeagus has two distal processes subequal in length and shape.

Description. Adult ( Fig. 7 ). Wingspan 10.5 ‒ 11.0 mm.

Head. Vertex and frons yellow, mottled with black scales. Labial palpus yellow, second segment black distally. Antenna yellow; scape black and flagellum anuulated with black on dorsal surface.

Thorax. Mesonotum black, yellow at base; tegula yellow. Forewing orange yellow, with black scales; costal margin black at base; arched black speckle from near base of dorsum obliquely outward crossing fold, then along above fold to near end of fold; discal spot black, elongate; postmedial fascia black, extending from costal 1/2 to tornus, arched outward medially; apical fascia wide, narrowed along termen; fringe yellow, mixed with black along termen, grey around tornus. Hindwing and fringe grey. Legs yellow, except three distal tarsomeres of fore- and midlegs black; on dorsal surface, foreleg with some black scales on femur and tibia, midleg with a few black scales on distal half of femur, tibia black at base, tarsus black at middle of first tarsomere and at base of second tarsomere. Male genitalia ( Fig. 23 ). Uncus narrowed from base to basal 1/4, then uniform to basal 1/2, distal 1/2 expanded elliptically. Gnathos annular, with small spines anteriorly. Valva with costal part subparallel to before obtusely rounded apex; costa almost straight; dorso-proximal process short, thumb shaped; sacculus slightly longer than half length of costal part of valva, narrowed from base to basal 2/3, distal 1/3 sub-digitate, with two denticles at apex. Aedeagus about 3/5 length of costal part of valva, gradually widened from base to middle, distal half consisting of two large processes: one process longer, narrowed to apex, with dense spines, the other process narrowed basally, sharply widened apically, produced into one longer lobe bearing teeth distally, and one short sub-triangular lobe with a pointed tip.

Female unknown.

Distribution. China (Yunnan).

Etymology. The specific epithet is derived from the Latin largus- and -lobus, referring to the two distal processes of the aedeagus.

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.