Periacma largiloba Wang & Xu 2024, sp. nov.
Creators: name: Wang, Shuxia
name: Xu, Zhixin
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Autostichidae
Periacma
Periacma largiloba

description: 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.
description: Published as part of Wang, Shuxia & Xu, Zhixin, 2024, Taxonomy of the genus Periacma Meyrick (Lepidoptera: Autostichidae) from China, with a checklist of the world species, pp. 101-129 in Zootaxa 5399 (2) on pages 109-110, DOI: 10.11646/zootaxa.5399.2.1, http://zenodo.org/record/10493947