Loxoneptera triangularis Chen & Zhang, 2021

Xiang, Lanbin, Chen, Kai & Zhang, Dandan, 2021, Revision and phylogeny of the genus Loxoneptera Hampson, 1896 (Lepidoptera, Crambidae, Pyraustinae), based on morphology and molecular data, ZooKeys 1036, pp. 75-98 : 75

Loxoneptera triangularis Chen & Zhang sp. nov. Figs 7 , 19

Material examined.

Type material. Holotype, ♂, China: Yunnan: Mengla, Xishuangbanna , 7.X.2004, leg. R. L. Kitching, genitalia slide no. FCEL0004 (FCEL) . Paratype: China: Yunnan: 1♂, Mengla, Xishuangbanna, 4.X.2004, leg. R. L. Kitching.

Diagnosis.

Externally, Loxoneptera triangularis resembles L. carnealis in the wing shape, but can be distinguish by the smaller wings, and costal and posterior areas of hindwing dark brown. In the male genitalia, it can be differentiated by the process on the dorso-distal sella with a strongly sclerotised stick, distal part of juxta with a strongly sclerotised and narrowly triangular process, and distal phallus with a relatively short and hook-shaped spine.

Description.

Head. Frons pale yellow, with white lateral bands, basal white bands mixed with reddish brown scales. Vertex pale yellow. Labial palpus reddish brown, ventral side with white scales. Maxillary palpus reddish brown, broadened distally with scales. Antennae yellowish brown. Thorax. Dorsal side, patagia and tegula yellowish brown, mixed with reddish brown scales, ventral side grey white. Legs pale yellow. Wings. Wingspan 23.0-25.0 mm. Forewing pale yellow, termen dark brown, as well as from costal margin to posterior margin of cell, apex mixed with reddish brown scales; orbicular stigma weak, appearing as a dark brown point, reniform stigma black-brown and weak; fringe dark brown. Underside of forewing black from costal margin to posterior margin of cell. Hindwing pale yellow between CuA2 and M2, remainders dark brown, without pattern, fringe yellow brown. Abdomen. Dorsal side of abdomen pale brown, ventral side grey white; sternite VIII in male slightly sclerotised with two stout anterolateral processes.

Male genitalia (Fig. 19 ). Uncus long and slender, distally narrowly rounded, with few hair-like setae. Saccus rounded. Dorsal projection of transtilla relatively slender and slightly curved, approximately as long as length of costa, distally bearing hair ~ 1/4 length of projection, basal 1/3 broad. Valva with dorsal margin slightly convex, ventral margin sinuated, apex narrowly rounded; costa slightly curved; dorsal sella membranous, with several setae, ventral sella with a small, hook-shaped and sclerotised process, narrow and pointed apically; dorso-distal sella with a long, stick-like, strongly sclerotised process, broad at terminal part, then pointed at apex; sacculus broad. Juxta shield-shaped, strongly sclerotised, distal part broad, with a strongly sclerotised and narrowly triangular process. Phallus long, distal end with a long and hook-shaped spine, narrow and pointed apically.

Female genitalia. Unknown.

Distribution.

China (Yunnan).

Etymology.

The specific name derived from the Latin Loxoneptera triangularis , referring to the triangular process in the end of juxta.

Figures

Figures 2 - 9. Adults of Loxoneptera spp. 2 L. hampsoni nom. nov., male (Tibet) 3 L. hampsoni nom. nov., female (Hainan) 4 L. albicostalis, male (Yunnan) 5 L. crassiuncata sp. nov., paratype, male (Yunnan) 6 L. carnealis, male (Yunnan) 7 L. triangularis sp. nov., holotype, male (Yunnan) 8 L. rectacerosa sp. nov., holotype, male (Yunnan) 9 L. medialis, male (Guangdong). Scale bars: 5.0 mm.

Figures 14 - 19. 14 The sternite VIII in male of L. albicostalis 15 - 19 Male genitalia of Loxoneptera spp. 15 L. hampsoni nom. nov., Hainan (genitalia slide no. SYSU 0929) 16 L. albicostalis, Yunnan (genitalia slide no. ZDD 12108) 17 L. crassiuncata sp. nov., Yunnan (genitalia slide no. FCEL 0010) 18 L. carnealis, Guizhou (genitalia slide no. SYSU 0165) 19 L. triangularis sp. nov., Yunnan (genitalia slide no. FCEL 0004). Scale bars: 1.0 mm.