Ephydra villosa Krivosheina et Ozerov, 2021

Krivosheina, M. G. & Ozerov, A. L., 2021, A review of the shore-fly genus Ephydra Fallén, 1810 (Diptera: Ephydridae) of Russia, Russian Entomological Journal 30 (3), pp. 345-360 : 358

Ephydra villosa Krivosheina et Ozerov , sp.n.

Figs 15 , 24 , 33 , 42 .

MATERIAL. Holotype ♂, Russia: Irkutsk Oblast, Baikal Lake, Sakhyurta env., MRS [=river station Malomorskaya) (53.017ºN 106.883ºE)], 19.VII.1962, Gorodkov ( ZISP). Paratype ♂ with same label ( ZMUM) .

DESCRIPTION. Medium sized flies, body length 5–5.5 mm.

Head golden-brown pollinose except metallic shining frontal vitta and upper face, with greenish tinge; fronto-orbital plate brownish pollinose. 3 long fronto-orbital setae, anterior interfrontal strong, about 1/2 of ocellar. Postocular setae strong. Palpus dark grey. Antenna blackish, brownish dusted; arista short pubescent on dorsal surface on basal 1/2. Gena and parafacial golden dusted.

Thorax black, brownish pollinose. Scutum subshining with bluish-greenish tinger. Acrostichals setulose in two rows, intra-alars 2+2.

Legs. Femora and tibia black, densely greyish dust- ed; tarsi of all legs yellowish, but tarsomeres 4 and 5 darkened.

Abdomen black, grey pollinose, subshining. Tergite 5 approximately equal in length to tergite 4. Male genitalia small, as long as tergite 5. Epandrium oval in dorsal (posterior) view ( Fig. 33 ), wider in cercal part, covered with long setae; surstyli relatively broad and curved, covered with many long setae. Epandrium curved in lateral view ( Fig. 42 ); surstylus is at obtuse angle to epandrium, with short subapical tooth. Aedeagus long and narrow with pointed tip in lateral view ( Fig. 15 ). Gonite with broad basal part and slender pointed tip in lateral view ( Fig. 24 ).

NOTE. The species is close to E. tibetensis Wirth, 1975 , differing from it in extremely developed setae and hairs on body and the structure of male genitalia; surstylus with well separated subapical tooth in lateral view, aedeagus with long apical narrow part, gonite significantly narrowed apically and curved at the very tip. From E. scholtzi the new species differs in strong postocular setae and from E. glauca in weaker pollinosity and the presence of subshining surfaces on upper face, scutum and abdomen. From both species it differs in the development of 2+2 intra-alar setae.

DISRTIBUTION. Russia: Irkutsk Oblast.

Figures

Figs 7–15. Aedeagus of Ephydra spp., lateral view: 7 — E. afghanica Dahl; 8 — E. attica Becker; 9 — E. glauca Meigen; 10 — E. japonica Miyagi; 11 — E. macellaria Egger; 12 — E. pseudomurina Krivosheina; 13 — E. riparia Fallén; 14 — E. sholtzi Becker; 15 — E. villosa sp.n. Рис. 7–15. Эдеагус Ephydra spp., сбоку: 7 — E. afghanica Dahl; 8 — E. attica Becker; 9 — E. glauca Meigen; 10 — E. japonica Miyagi; 11 — E. macellaria Egger; 12 — E. pseudomurina Krivosheina; 13 — E. riparia Fallén; 14 — E. sholtzi Becker; 15 — E. villosa sp.n.

Figs 16–24. Gonite of Ephydra spp., lateral view: 16 — E. afghanica Dahl; 17 — E. attica Becker; 18 — E. glauca Meigen; 19 — E. japonica Miyagi; 20 — E. macellaria Egger; 21 — E. pseudomurina Krivosheina; 22 — E. riparia Fallén; 23 — E. sholtzi Becker; 24 — E. villosa sp.n. Рис. 16–24. Гонит Ephydra spp., сбоку: 16 — E. afghanica Dahl; 17 — E. attica Becker; 18 — E. glauca Meigen; 19 — E. japonica Miyagi; 20 — E. macellaria Egger; 21 — E. pseudomurina Krivosheina; 22 — E. riparia Fallén; 23 — E. sholtzi Becker; 24 — E. villosa sp.n.

Figs 31–33. Epandrium and surstyli of Ephydra spp., dorsal view: 31 — E. riparia Fallén; 32 — E. sholtzi Becker; 33 — E. villosa sp.n. Рис. 31–33. Эпандриум и сурстили Ephydra spp., сверху: 31 — E. riparia Fallén; 32 — E. sholtzi Becker; 33 — E. villosa sp.n.

Figs 40–42. Epandrium and surstyli of Ephydra spp., lateral view: 40 — E. riparia Fallén; 41 — E. sholtzi Becker; 42 — E. villosa sp.n. Рис. 40–42. Эпандриум и сурстили Ephydra spp., сбоку: 40 — E. riparia Fallén; 41 — E. sholtzi Becker; 42 — E. villosa sp.n.