Tylostega luniformis Du & Li

Du, Xicui & Li, Houhun, 2008, A review of Tylostega Meyrick from Mainland China (Lepidoptera, Crambidae, Spilomelinae), with descriptions of four new species, Zootaxa 1681, pp. 51-61 : 56-58

publication ID	https://doi.org/ 10.5281/zenodo.180403
DOI	https://doi.org/10.5281/zenodo.6230926
persistent identifier	https://treatment.plazi.org/id/CC169D2B-FF88-FFF7-79F5-A082FE79FDE2
treatment provided by	Plazi
scientific name	Tylostega luniformis Du & Li
status	sp. nov.

Treatment

Tylostega luniformis Du & Li , sp. nov.

( Figs. 3 View FIGURES 1 – 5 , 10 View FIGURES 8 – 12 , 15 View FIGURES 13 – 17 , 20 View FIGURES 18 – 21 )

Type specimens. Holotype ɗ, CHINA: [label 1] “Baoxing County (30°22' N, 102°50' E), Sichuan Province / 1600 m elev. / 2. VIII. 2004 / leg. Yingdang Ren”; [label 2] “genitalia slide ɗ / DXC06348”; [label 3, red] “ Holotype ɗ / Tylostega / luniformis / Du et Li”. Paratypes: 9 ɗ, Médog County (29°13' N, 95°18' E), Xizang (Tibet) Autonomous Region, 1100 m, 14. VIII. 2003, leg. Xinpu Wang & Huaijun Xue; 4 ɗ, 5 Ψ, 2–3. VIII. 2004, other same data as holotype.

Diagnosis. This species is similar to T. tylostegalis (Hampson) externally, but distinguishable by the male antenna with ventral cilia about 1.5 times as long as flagellomere diameter; the valva with a large oval projection medially; the dorsal margin of the sacculus smooth and concave at basal 1/3; the juxta with a strong hornlike process mediolaterally; and the phallus with two spinelike and one luniform cornuti. In T. tylostegalis , the ventral cilia of the male antenna is about as long as the flagellomere diameter; the valva has a small triangular projection medially; the dorsal margin of the sacculus bears small teeth and is not concave at basal 1/3; the juxta has no strong hornlike process; and the phallus has three spinelike cornuti.

Description. Adult ( Fig. 3 View FIGURES 1 – 5 ). Wing span 20.0–21.0 mm. Frons yellowishwhite except fuscous anteriorly. Antenna with ventral cilia about 1.5 times as long as flagellomere diameter in male, minute in female. Labial palpus yellowishwhite, 2nd segment brown or fuscous dorsally and distally, 3rd segment brown laterally. Thorax yellowishwhite or pale yellow dorsally, each segment with a fuscous blotch. Patagium, tegula and forewing pale yellow, diffused with brown scales. Forewing with fuscous patches at base, discoidal stigma and lines blackishfuscous, lines forming blackishfuscous spots on costa; postmedial line sinuated as in T. pectinata , distinct only on costa; terminal margin with a series of blackishfuscous spots. Hindwing yellowishwhite, with large fuscous patch at base, suffused with brown in distal half; discoidal stigma dark fuscous, claviform; terminal margin with some inconspicuous fuscous spots. Cilia of both fore and hindwings light brownishyellow, paler at distal. Abdomen with dorsal surface white with fuscous patches on 1st segment, blackishfuscous on 2nd–5th segments, and pale yellow on 6th–8th segments; ventral surface pale yellow mottled brown.

Male genitalia ( Figs. 10 View FIGURES 8 – 12 , 15 View FIGURES 13 – 17 ). Uncus with height greater than basal width. Valva slightly narrowed in distal 1/2, with large, median oval projection bearing dense small spines anteriorly. Sacculus concave at basal 1/ 3 dorsally, arched medially, then gradually narrowed to subapex; distal end inflated triangularly, with toothlike process. Saccus short and broad, semicircular. Juxta gradually broadened backwards, with strong hornlike process mediolaterally. Phallus with one large and one small spinelike, and one luniform cornuti.

Female genitalia ( Fig. 20 View FIGURES 18 – 21 ). Apophysis anterioris about 1.5 times length of apophysis posterioris. Ductus bursae twisted, more sclerotized in basal 1/3, bearing strong thumblike process near base; basal part before process about 2 times width of remainder part; with broad transverse stripes consisting of small granules in distal 2/3. Corpus bursae slightly shorter than ductus bursae, gradually broadened to distal end.

Distribution. China (Sichuan, Tibet).

Etymology. The specific name is derived from the Latin luniformis = luniform, in reference to the crescentshaped cornutus.