Loxoneptera rectacerosa 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 rectacerosa Chen & Zhang sp. nov. Figs 8 , 20

Material examined.

Type material. Holotype, ♂, China: Yunnan: Yexianggu, Xishuangbanna , 22.17°N, 100.87°E, alt. 762 m, 18.VII.2014, leg. Teng Kaijian et al., genitalia slide no. ZDD12059 , molecular voucher no. LEP0170 (NKU).

Diagnosis.

Loxoneptera rectacerosa resembles L. medialis in wing pattern, but the forewing of L. rectacerosa is brown from the costal margin to posterior margin of the cell, and white on costal margin, whereas it is pale yellow in L. medialis . In the male genitalia, dorsal margin of valva of L. rectacerosa makes a turn in the end, forming a distinct obtuse subapical angle; the process of the dorso-distal sella is smaller and shorter than that of L. medialis ; distal end of phallus has a small and triangular sclerite, vesica is just with a group of spines.

Description.

Head. Frons pale yellow, with white lateral bands. Vertex pale yellow. Labial palpus brown, with white scales on ventral side. Maxillary palpus brown, broadened distally with scales. Antennae yellowish brown. Thorax. Dorsal side, patagia and tegula yellowish brown, ventral side grey white. Legs white to yellowish white. Wings. Wingspan 29.0 mm. Forewing brown, mixed with reddish brown scales, costal margin white, posterior area pale yellow; orbicular stigma weak, appearing as a dark brown point, reniform stigma absent; fringe black-brown. Hindwing pale yellow, without any spot, apex mixed with a few pale brown scales. Underside of forewing black on cell. 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. 20 ). Uncus long and slender, distally narrowly rounded, with few hair-like setae. Saccus rounded. Dorsal projection of transtilla relatively slender and slightly curved, ~ 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 slightly pointed; costa straight, and making a turn on 1/5 of the end, forming a break angle on dorsal margin of valva subapically; dorsal sella membranous, with several setae; ventral sella with a hook-shaped and strongly sclerotised process, narrow and pointed apically; dorso-distal sella with a short and weakly sclerotised process; sacculus broad. Juxta with basal part narrow, two arms long and slender, pointed apically. Phallus long and slightly curved, distal end with a semi-circular sclerite, vesica with a group of short, straight, spine-shaped cornuti.

Female genitalia. Unknown.

Distribution.

China (Yunnan).

Etymology.

The specific name derived from the Latin rect - (straight) and arcerosus (spine-shaped), referring to the shape of cornuti in phallus.

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 20 - 25. Male genitalia of Loxoneptera spp. 20 L. rectacerosa sp. nov., Yunnan (genitalia slide no. ZDD 12059) 21 L. medialis, Guangdong (genitalia slide no. SYSU 0987) 22 L. pentasaris, India (Pyralidae Brit. Mus. Slide No. 9747) 23 L. bipunctalis, India (Pyralidae Brit. Mus. Slide No. 9750) 24 L. brevipalpis, India (Pyralidae Brit. Mus. Slide No. 9748) 25 L. dichroma, India (Pyralidae Brit. Mus. Slide No. 9749). Scale bars: 1.0 mm.