Dichaeta ussurica Krivosheina, 1986

Krivosheina, M. G., 2012, Restoration Of The Name Dichaeta Ussurica Krivosheina, 1986 (Diptera: Ephydridae), Far Eastern Entomologist 252, pp. 27-31 : 28-30

Dichaeta ussurica Krivosheina, 1986 , nom. ressur.

Figs 4–5 , 8–9 , 11

MATERIAL EXAMINED. Holotype, ♂, the south part of Primorskii krai, 40 km SE Ussurijsk, 14.VIII 1984 (A. Ozerov) and paratypes: 10 ♂, the same label; 2 ♂, Amurskaya oblast, Zeya River, 27.VI 1982, 28.VII 1982 (M. Krivosheina) ( ZMUM).

DESCRIPTION. Body length 3-4,5 mm. Black in dark-brown microtomentum. Frons with 2 black isolated stripes; orbita and ocellar triangle brown. Face in dark brown, occiput in grey microtomentum. Face with 2 strong setae and 1 shorter hair below them. Palpae yellow. Arista with 6 rays. Thorax brown, scutum with 3 greyish stripes, katepisternum grey. Both npl setae are equal in size. Halters brown. Wings grayish almost hyaline or brownish, veins black. Legs black, tarsi yellowish, darkened dorsally. Abdomen black. Tergite IV with 4-10 long posteriorly directed setae, tergite V elongated in slender tube with 2 apical setae. Basal fused part of surstyli narrow, apical parts of surstyli directed outside ( Fig. 4 ), curved surstyli equal to adjoining part of epandrium ( Fig. 5 ), the shape of surstyli in lateral view differing form those of “transversa”. Male abdominal sternite 5th as long as wide, with 4 projections anteriorly; abdominal sternite 4th longer than wide ( Figs 8-9 ).

DISTRIBUTION ( Fig. 11 ). Palaearctic: Russian Far East (Primorskii krai, Amurskaya oblast).

3 – lateral view; 4, 5 – D. ussurica : 4 – dorsal view, 5 – lateral view.

5th sternite, 7 – 4th sternite; 8, 9 – D. ussurica : 8 – 5th sternite, 7 – 4th sternite.

2007); 11 – D. ussurica (original).

NOTES. As for the lectotype specimen of the Dichaeta transversa is in poor condition, I couldn't compare external characters of D. transversa and D. ussurica . However the differences in the structure of abdominal sternites are distinct: abdominal sternite 5th of D. transversa 2 times as long as wide and bilobed anteriorly; this sternite is of about rectangular shape and with 4 small anterior projections in D. ussurica ; the shape of abdominal sternite 4th is distinct also. Genitalia are also different: basal fused part of surstyli broad in D. transversa and narrow in D. ussurica , apical parts of surstyli directed inside in the former species and outside in the latter; curved surstyli longer than adjoining part of epandrium in D. transvesra and equal to it in D. ussurica . The areas of two species are very different and testify to their geographical isolation. Herein I restore Dichaeta ussurica as a good species.

Two distributed in Russia species of Dichaeta can be distinguished by the following characters.

Figures

Figs 2–5. Epandrium and fused surstyli of Dichaeta. 2, 3 – D. transversa: 2 – dorsal view,

Figs. 6–9. Abdominal sternites V and IV, ventral view: 6, 7 – Dichaeta transversa: 6 –

Figs. 10–11. Distribution maps. 10 – Dichaeta transversa (after Mathis & Zarwarnicki,