Tylostega luniformis Du & Li, sp. nov.
Creators: name: Du, Xicui
name: Li, Houhun
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Crambidae
Tylostega
Tylostega luniformis

description: Tylostega luniformis Du & Li, sp. nov.
(Figs. 3, 10, 15, 20)
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). 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, 15). 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). 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.
description: Published as part of Du, Xicui & Li, Houhun, 2008, A review of Tylostega Meyrick from Mainland China (Lepidoptera, Crambidae, Spilomelinae), with descriptions of four new species, pp. 51-61 in Zootaxa 1681 on pages 56-58, DOI: 10.5281/zenodo.180403