Cryptochetum glochidiatusum, 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 : 6-9

Cryptochetum glochidiatusum sp. nov.

urn:lsid:zoobank.org:act:AC6FB5F5-5312-4F14-BCD5-666297C62955

Figs 8–14

Diagnosis

Ocellar triangle approximately in equilateral triangle, apical angle slightly wider than the distance between antennae. Surstylus extremely narrowed and blunt apically.

Etymology

The species epithet refers to the shape of epandrium, which is spheroid in dorsal view.

Type material

Holotype

CHINA • ♂; Yunnan, Tengchong, Cizhuhe ; 25°43′12″ N, 98°37′48″ E; alt. 2300 m; 8 Jun. 2012; Fei-Y. Liang leg.; EMHAU CR122 .

Paratypes

CHINA • 3 ♂♂; same data as for holotype; EMHAU DICR0074 .

Description

MALE. Body length: 1.6–1.8 mm; wing length: 1.5–1.6 mm.

HEAD. Black ( Fig. 8 ); ocellar triangle shiny black with metallic luster ( Fig. 9 ), approximately in equilateral triangle, apex slightly flat; lunule strap-shaped, very narrowed, sooty black. Eye darkish red, bare, 1.8 × as high as long, gena approximately one fourteenth 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 curved, 0.4 mm long, 0.2 mm wide, apical angle with stout conical tubercle, nearly as long as surrounding setulae. Proboscis flat and short, brownish yellow, with short sparse black setulae, labellum slightly wide. Palpus very 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, 0.5 × as long as thorax. Apical setae longer and stouter than other setae. Anepisternum darkish brown with setulae, katepisterunum 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 1.8 × as long as wide; veins brown; costa vein (C) extending to end of R 4+5 and terminating before apex of wing; subcostal vein (Sc) weak, not angulate; R 1 curved, not angulate, 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 1.2 × as long as dm-m, dm-m slightly straight, not sinuous, forming an angle at 90° with M 4, distal portion of M 4 (the part beyond dm-m) 1.8 × as long as dm-m ( Fig. 10 ). Calypter brownish, with brownish microtrichae, margin with brownish setulae. Knob of haltere blackish brown, 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 11–12 ) slightly wide and spheroid dorsally, with setulae apically; surstylus slightly blunt apically; cercus rather narrowed, with dense setulae. Hypandrium ( Figs 13–14 ) irregularly rectangular; gonopods slightly small and symmetric; phallus thin, distipallus slightly enlarge.

Female

Unknown.

Distribution

China (Yunnan).

Remarks

This new species differs from other species of Cryptochetum as follows: the antenna is far away from the ocellar triangle, the postpedicel is irregularly rectangular; the epandrium is nearly circular and the cercus is rather narrowed.

Figures

Figs 8–10. Cryptochetum glochidiatusum sp. nov., holotype, ♂ (CR122). 8. Head, lateral view. 9. Head, dorsal view. 10. Wing, dorsal view. Scale bar = 0.1 mm.

Figs 11–14. Cryptochetum glochidiatusum sp. nov., holotype, ♂ (CR122). 11. Dorsal view. 12. Lateral view. 13. Dorsal view. 14. Lateral view. Scale bars: 11–12 = 0.1 mm; 13–14 = 0.05 mm.