Cryptochetum longilingum, 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 : 9-11

Cryptochetum longilingum sp. nov.

urn:lsid:zoobank.org:act:F512F49C-833B-4D78-9EA0-05C0C8B831B0

Figs 15–21

Diagnosis

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

Etymology

The species epithet refers to the long proboscis.

Type material

Holotype

CHINA • ♂; Yunnan, Zhongdian , hongshan; 27°48′36″ N, 99°42′36″ E; alt. 3260 m; 12 Jun. 2012; Yu-Y. Wang leg.; EMHAU CR154 .

Paratypes

CHINA: 2 ♂♂; Yunnan, Mangshi, Zhefang ; 24°15′36″ N, 98°15′29″ E; alt. 1200 m; 4 Jul. 2014; Wei Zhang leg.; EMHAU DICR0096 .

Description

MALE. Body length: 2.4–2.5 mm; wing length: 2.6–2.7 mm. HEAD. Black ( Fig. 15 ); ocellar triangle shiny black with metallic luster ( Fig. 16 ), approximately in isosceles triangle, apex slightly flat; lunule strap-shaped, very narrow, sooty black. Eye darkish red, bare, 1.9 × as high as long, gena approximately 1/ 9 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 darkish brown with microtomentum, large, shorter than face; scape and pedicel with black setulae at middle and margin; postpedicel with pubescence, irregularly rectangular, front margin straight, apical margin obtuse, 0.6 mm long, 0.3 mm wide, apical angle with stout conical tubercle, nearly as long as surrounding setulae. Proboscis flat and long, brownish yellow, with short sparse black setulae, labellum slightly wide. Palpus short, apically enlarged and rounded, dark brown with short dense black pubescence, margin with short sparse setulae.

THORAX. Shiny, blackish brown with 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, 0.6 × as long as thorax. Apical setae longer and stouter than other setae. Anepisternum darkish brown with setulae; katepisternum and anepimeron brown, bare. Legs slender, blackish brown except tarsi darkish yellow. Setae and setulae on legs black. Wing hyaline with greenish and purplish reflections, unspotted, slightly 1.5 × as long as wide; veins brown; costal vein (C) extending to end of R 4+5 and terminating before 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) 1.5 × as long as dm-m ( Fig. 17 ). Calypter brownish, with brownish microtrichae, margin with brownish setulae. Knob of haltere darkish yellow, stalk brownish.

ABDOMEN. Brownish black with a metallic blue-green luster, wide and slightly flattened. Setae and setulae on abdomen black. Male terminalia: epandrium ( Figs 18–19 ) slightly wide dorsally, broadest in middle, with setulae; surstylus slightly narrowed and blunt apically; cercus rather narrow, with dense setulae. Hypandrium ( Figs 20–21 ) n-shaped; gonopods small and symmetric; phallus slender, distipallus slightly enlarged.

Female

Unknown.

Distribution

China (Yunnan).

Remarks

This new species is somewhat similar to C. sinicum Yang & Yang , but may be separated from it by M 1 between r-m and dm-m 1.2 × as long as dm-m, ocellar triangle approximately in isosceles triangle. In C. sinicum , M 1 between r-m and dm-m 1.7 × as long as dm-m, ocellar triangle approximately in equilateral triangle ( Yang & Yang 1996).

Figures

Figs 15–17. Cryptochetum longilingum sp. nov., holotype (CR154), ♂. 15. Head, lateral view. 16. Head, dorsal view. 17. Wing, dorsal view. Scale bar = 0.1 mm.

Figs 18–21. Cryptochetum longilingum sp. nov., holotype, ♂ (CR154). 18. Dorsal view. 19. Lateral view. 20. Dorsal view. 21. Lateral view. Scale bars: 18–19 = 0.1 mm; 20–21 = 0.05 mm.