Cryptochetum euthyiproboscise, Yin, 2020

Xi, Yuqiang & Yin, Xinming, 2020, Three new Cryptochetum Rondani, 1875 (Diptera: Cryptochetidae) from Yunnan Province, China and an identification key to Chinese species, European Journal of Taxonomy 605 (605), pp. 1-15 : 4-6

Cryptochetum euthyiproboscise sp. nov.

urn:lsid:zoobank.org:act:0DD2BF7C-1EC1-48FD-AF31-5D3883B239CE

Figs 1–7

Diagnosis

Ocellar triangle approximately in isosceles triangle, apical angle shorter than the distance between antennae. Surstylus slightly narrowed and sharp apically.

Etymology

The species epithet refers to the straight palpus.

Type material

Holotype

CHINA • ♂; Yunnan, Tengchong, Zizhi ; 25°44′24″ N, 98°33′36″ E; alt. 2100 m; 31 May 2007; Yan-L. Li leg.; EMHAU CR101 .

Paratypes

CHINA: 2 ♂♂, Yunnan, Mangshi, Zhefang ; 24°15′36″ N, 98°15′29″ E; alt. 1200 m; 4 Jul. 2014; Wei Zhang leg.; EMHAU DICR0013 .

Description

MALE. Body length: 2.2–2.4 mm; wing length: 2.6–2.8 mm.

HEAD. Darkish brown ( Fig. 1 ); ocellar triangle shiny brown with metallic luster ( Fig. 2 ), approximately in isosceles triangle, apex slightly flat; lunule strap-shaped, very narrow, brown. Eye red, bare, 1.8 × as high as long, gena approximately ⅛ of eye height. Setae and setulae on head black; ocelli darkish yellow, placed close together. Ocellar triangle with short setulae, punctures at bases of setulae conspicuous; frons without setae, orbital setae lacking; postvertical setae erect, considerably stouter and longer than other setulae on vertex. Antenna brown with microtomentum, large, same length as face; scape and pedicel with black setulae at middle and margin; postpedicel with pubescence, irregularly rectangular, front margin straight, apical margin curved, 0.5 mm long, 0.2 mm wide, apical angle with stout conical tubercle, a little longer than surrounding setulae. Proboscis flat and straight, brown, with short sparse black setulae, labellum slightly wide. Palpus short, ca 0.2 mm long, apically rounded, darkish brown with short dense black pubescence, margin with short sparse setulae.

THORAX. Shiny, darkish brown with brownish stripes and metallic blue-green luster; scutellum shiny, blackish brown. Setae and setulae on thorax black, punctures at bases of setulae deep and numerous; scutellum large, approximately triangular, wide and rounded apically, 0.5 × as long as thorax. Apical setae longer and stouter than other setae. Anepisternum brown with setulae, katepisterunum and anepimeron brownish, bare. Legs slender, blackish brown except tarsi yellowish. Setae and setulae on legs black. Wing hyaline with greenish and purplish reflections, unspotted, 2.3 × as long as wide; veins brown; costal vein (C) extending to end of R 4+5 and terminating at apex of wing; subcostal vein (Sc) weak, slightly angulated; R 1 curved, not angulated, R 2+3 and R 4+5 parallel for 4/ 5 along their lengths, then diverging to wing margin; r-m short; M 1 between r-m and dm-m 1.5 × as long as dm-m, dm-m slightly sinuous, forming an angle nearly at 90° with M 4, distal portion of M 4 (the part beyond dm-m) 1.9 × as long as dm-m ( Fig. 3 ). Calypter brownish, with brownish microtrichae, margin with brownish setulae. Knob of haltere dark brown, stalk brown.

ABDOMEN. Brownish black with a metallic blue-green luster, wide and slightly flattened. Setae and setulae on abdomen black. Male terminalia: epandrium ( Figs 4–5 ) reduced to thick band dorsally, with sides broadest in middle, with setulae; surstylus slightly narrowed and sharp apically; cercus rather large, with dense setulae. Hypandrium ( Figs 6–7 ) n-shaped; gonopods small and symmetric; phallus slender, distipallus slightly wide.

Female

Unknown.

Distribution

China (Yunnan).

Remarks

This new species is somewhat similar to C. kunmingense Yang & Yang, 1996 , but may be separated from it by M 1 between r-m and dm-m 1.6 × as long as dm-m; distal potion of M 4 (the part beyond dm-m) 1.9 × as long as dm-m. In C. kunmingense , M 1 between r-m and dm-m 1.2 × as long as dm-m; distal potion of M 4 (the part beyond dm-m) 1.4 × as long as dm-m ( Yang & Yang 1996).

Figures

Figs 1–3. Cryptochetum euthyiproboscise sp. nov., holotype, ♂ (CR101). 1. Head, lateral view. 2. Head, dorsal view. 3. Wing, dorsal view. Scale bar = 0.1 mm.

Figs 4–7. Cryptochetum euthyiproboscise sp. nov., holotype, ♂ (CR101). 4. Dorsal view. 5. Lateral view. 6. Dorsal view. 7. Lateral view. Scale bars: 4–5 = 0.1 mm; 6–7 = 0.05 mm.