Oxyceroides gracilis, Yang, Zai-Hua, Rozkošný, Rudolf & Ya, Mao-Fa, 2015

Yang, Zai-Hua, Rozkošný, Rudolf & Ya, Mao-Fa, 2015, A new genus and three new species of tribe Oxycerini (Diptera: Stratiomyidae) from Oriental region, Zootaxa 4057 (1) : -

Oxyceroides gracilis sp. nov.

(Figs 3–13, 33, 35)

Specimens examined. Holotype: CHINA, 1 ♂, 16-18.vi.2006. Bizuo, 500 m, 25º17’20”N, 108º 04’02”E, Maolan, Libo, Guizhou province, Zai-Hua Yang leg (GUGC). Paratypes: CHINA, 1♂ 1♀, 12.v.2013, Ban’geng, 500 m, Luodian, Guizhou province, Zai-Hua Yang leg (GAFC); 6♂ 1♀, 16–18.vi.2006. Sanchahe, 500–600 m, Maolan, Libo, Guizhou province, Zai-Hua Yang leg (GUGC); 2♂ 1♀, 12.v.2011, Tongbiguan, Yingjiang, Yunnan province, China Jiankun Long leg (GAFC); 1♂, 29.v.2009, Mts. Gaoligong, 24°58’N 98°48’E, 1800–2400 m, Baoshan, Yunnan Province, Zaihua Yang & Bin Li leg (GUGC); 6♂ 1♀, 12–13.iv.2012, Longgang, Longzhou, Guangxi, Jiankun Long leg (GAFC); 1♂ 1♀, 26.iv.2012, Encheng, Daxin, Guangxi, Jiankun Long leg (GAFC); 2♂, 21.iv.2012, Shuolong, Daxin, Guangxi, Jiankun Long leg (GAFC).

Diagnosis. Scutellar spines distinctly longer than the length of the scutellum. The male terminalia area with very developed Phallic complex, which completely enveloped by the parameral sheath ( Figs 12–13 ). Medial bare area in female frons, above the frontal whitish hair spots, not separated by a fine middle groove (Fig. 4). The frontal spots merged medially and touching the base of antennae. Whitish tomentose facial stripes along inner eye margins unusually long, arising far above the level of the antennal insertion.

Description. Male (Figs 3, 5, 7, 10–13). Body length: 5.0– 5.5mm, wing length: 4.5 mm. Head wider than thorax, black, about 1.2 times wider than high in frontal view, 1.4 times higher than long in lateral view. Eyes contiguous, reddish brown and bare. Frons triangular, small, black with grayish hairs and a longitudinal line in the middle. Antennae ( Fig 10 ) longer than head, scape and pedicel yellow with sparse yellow hairs, scape longer and slightly more slender than pedicel, basal 3 flagellomeres brownish yellow, apical 3 flagellomeres almost black, relative lengths of scape, pedicel and flagellomeres as 1.9: 1.3: 1.0: 0.9: 0.9: 1.7: 1.7: 2.6 (cf. Fig. 10 ). Face black, very slightly produced, sparsely grayish white haired. Lateral whitish stripes of face along inner margin of eyes well distinct (cf. Fig. 3). Occiput shinning black, with sparse and short white hairs. Proboscis yellow, with sparse yellow long hairs.

Thorax longer than wide, scutum black, postpronotal and postalar calli brownish yellow; scutellum including scutellar spines yellow, scutellar spines distinctly longer than scutellum at middle. Pleura shinning brown except narrow yellow upper margin of anepisternum. Pubescence inconspicuous, white and sparse. Wing ( Fig 9 ) hyaline, sometimes with diffuse brownish spots at cup cell, nearby base half of CuA1 and middle of M1. Stigma and veins brownish yellow. Halter brownish yellow with yellow stem. Legs completely yellow.

Abdomen (cf. Figs 5, 7) slender, at most 0.8 times as wide as thorax, often laterally compressed and then only half as broad as thorax; dark brown, sparsely dark haired, venter usually somewhat paler. Male terminalia ( Figs 11– 13 ) exposed, proctiger subtriangular, cerci elongate-oval, about 2.5–3.0 times as long as broad at middle, epandrium at middle part slightly shorter than proctiger. Genital capsule subquadrate, somewhat narrowed proximally, with posterior medial process hardly developed, simple, and with concave proximal margin. Each gonostylus dilated at middle, with a narrow dorsolateral lobe. Phallic complex trifid, completely enveloped by the parameral sheath, with its apical half conspicuously sinuate in lateral view; medial lobe slightly longer than lateral lobes. Parameral sheath with two distal projections, reaching lateral lobes apically. A massive and long aedeagal apodeme and long gonocoxal apodeme, both strongly exceeding the anterior margin of genitalia.

Female (Figs. 4, 6, 8). Body length 4.8–5.2 mm, wing length about 4.0 mm. Similar to male, but eyes widely separated with a distinct broad black postocular rim. Head about 1.2 times broader than high in frontal view and about 1.6 times higher than long in lateral view. Frons about 0.46 times as broad as head in frontal view, shinning black with dense punctation and whitish hairs, upper hairs denser and longer than lower ones, lower with a bare are above antennae. Wing as in male but diffuse spots seem to be more developed. Abdomen usually dilated at middle, usually about width of thorax, abdominal hairs usually longer than in male. Female terminalia ( Figs 33, 35 ): apical segment cerci nearly long spindle, about 1.7 times length and 0.8 times width of basal one; genital furca with a long flat lateral proximal process and a clypeiform base, median aperture of genital furca nearly circular.

Geographical distribution. China (Guizhou, Guangxi, Yunnan).

Etymology. The species name is feminine, and the specific epithet comes from Latin roots gracilis , meaning slender, thin, as an allusion to the particular shape of the male abdomen of this species.

Figures

FIGURES 9 – 13. Oxyceroides gracilis sp. nov. male paratype. 9. Wing. 10. Antennae. 11. Epandrium, proctiger and cerci, dorsal view. 12. Phallic complex, lateral view. 13. Genital capsule and phallic complex complex, dorsal view.

FIGURES 33 – 36. Oxyceroides gracilis sp. nov. and Oxyceroides sinica sp. nov. female paratype. 33. ♀ terminalia (O. gracilis sp. n.), dorsal view; 34. ♀ terminalia (O. sinica sp. n.), dorsal view; 35. ♀ genital furca (O. gracilis sp. n.), dorsal view; 36. ♀ genital furca (O. sinica sp. n.), dorsal view.