Spatulignatha arcuata, Liu, Shurong & Wang, Shuxia, 2014

Liu, Shurong & Wang, Shuxia, 2014, Taxonomic review of the genus Spatulignatha Gozmány, 1978 (Lepidoptera: Lecithocerinae), with descriptions of two new species in China, Zootaxa 3793 (3), pp. 361-370 : 362-363

Spatulignatha arcuata sp. nov.

( Figs. 1 b, 2b, 3b, 4a)

Type material. Holotype ♂, CHINA: Mt. Dadong, Lianzhou City (24°26′N, 112°22′E), Guangdong Province, 116 m, 25.vi.2004, coll. Dandan Zhang, genitalia slide No. ZMR10159. Paratypes: 2 ♂, 1 ♀, Mt. Xiaohei (24°14′N, 98°51′E), Longling County, Yunnan Province, 2300 m, 10.viii.2005, coll. Yingdang Ren; 1 ♀, Dahaoping (24°58′N, 98°43′E), Tengchong County, Yunnan Province, 2020 m, 6.viii.2007, coll. Dandan Zhang; 3 ♂, Mt. Badagong (29°39′N, 109°49′E), Sangzhi County, Hunan Province, 1250 m, 12.viii.2001, coll. Houhun Li, Xinpu Wang.

Description. Adult ( Figs. 1 b, 2b): Wingspan 20.0–21.0 mm. Head yellowish white. Antenna yellow. Labial palpus yellow; second segment expanded distally, about twice length of first segment in male; second segment slightly thick, third segment slender, a little longer than second, pointed terminally in female. Thorax and tegula brown. Forewing with costal margin straight, apex bluntly rounded, termen oblique; ground color yellowish brown except termen blackish brown and scattered with brown scales; cell-dot blackish brown, small, nearly rounded; discocellar spot blackish brown, relatively large, short claviform; tornal stripe obliquely inward, reaching lower margin of cell; cilia pale yellow. Hindwing grayish yellow; cilia pale yellow. Fore legs yellowish brown, tarsi with brown bands on ventral surface; mid legs yellowish brown; hind legs pale yellow, tibia covered with long yellowish white hairs.

Male genitalia ( Fig. 3 b): Uncus large, nearly triangular; caudal margin slightly concave medially, bearing setae on dorsal surface. Gnathos with basal 2/3 relatively broad, distal 1/3 conspicuously tapering to apex. Costal bridge narrow, triangularly angled medially. Valva with basal 1/3 broad, nearly parallel dorso-ventrally medially, distal 1/ 3 slightly widened to blunt apex; sacculus long, about 2/3 length of valva, its basal half broad, nearly elliptical, distal half narrowed to pointed apex, ventral margin with hard hairs at middle. Juxta large, anterior margin roundly protruded medially, caudal margin deeply split in middle; postero-lateral lobes nearly rectangular, obliquely straight terminally. Vinculum with anterior margin protruded semicircularly. Aedeagus a little longer than valva, dilated basally, narrowed distally, with numerous small teeth at base, with two sclerotized irregular plates medially, bearing one tooth at distal 1/3 on ventral surface.

Female genitalia (Fig. 4a): Apophyses posteriores about twice as long as apophyses anteriores, nearly extended to anterior margin of abdominal sternite VIII, widened distally. Lamella antevaginalis an arched, narrowly bandshaped plate, its posterior margin bluntly rounded, anterior margin concave medially. Antrum funnel-shaped, weakly sclerotized. Ductus bursae about twice as long as corpus bursae, basal half narrow, with heavily sclerotized narrow bands, distal half expanded, membranous; ductus seminalis arising from middle of ductus bursae. Corpus bursae rounded; signum placed anteriorly, small, irregularly elliptic, with teeth.

Diagnosis. This species is similar to S. idiogena Wu, 1994 , but can be separated from the latter by the juxta with the nearly rectangular postero-lateral lobes obliquely straight terminally, and the vinculum with anterior margin semicircularly protruded in the male genitalia, and the ductus bursae about twice as long as the corpus bursae in the female genitalia. In S. idiogena , the angled postero-lateral lobes of the juxta are pointed terminally, and the vinculum is broadly rounded on the anterior margin; and the ductus bursae is about 2/3 length of the corpus bursae.

Distribution. China (Guangdong, Hunan, Yunnan).

Etymology. The specific name of this species is derived from the Latin arcuatus (arcuate), in reference to the arched lamella antevaginalis.

Figures

FIGURE 1. Male adults of Spatulignatha spp. a, S. chrysopteryx; b, S. arcuata sp. nov.; c, S. hemichrysa; d, S. idiogena; e, S. longizonalis sp. nov.; f, S. olaxana. (Scales = 2.0 mm).

FIGURE 3. Male genitalia of Spatulignatha spp. a, S. chrysopteryx, slide No. LSR 13076; b, S. arcuata sp. nov., slide No. LSR 13057; c, S. hemichrysa, slide No. LSR 11007; d, S. idiogena, slide No. LSR 12089; e, S. longizonalis sp. nov., slide No. LSR 13039; f, S. olaxana, slide No. LSR 11204. (Scales = 0.5 mm).