Lamproscatella aklavik Mathis, 1979

Krivosheina, M. G., 2022, On distribution of the shore fly Lamproscatella aklavik Mathis, 1979 (Diptera: Ephydridae) in the Palaearctic Region, Far Eastern Entomologist 451, pp. 16-18 : 17-18

Lamproscatella aklavik Mathis, 1979

Figs 1–3

Lamproscatella aklavik Mathis, 1979: 27 (type locality: Aklavik , the Northwest Territories,

Canada).

MATERIAL EXAMINED. Russia: Tuva, Kyzyl , poplar-birch forest, 51.7º N, 94.7º E ,

15–25. V 2018, 1♂, leg. N. Vikhrev (deposited in the Zoological Museum of Moscow Uni-

versity).

DESCRIPTION. The species has general black coloration. Head, antenna, palpus black.

Face golden-brown pollen with a small silvery pollen part just below antenna ( Fig. 1 ).

Ocellar triangle brown pollen. Black coloration of fronto-orbital plates reaching inner vertical setae posteriorly, not ending at the level of fronto-orbital setae. The height of gena significantly less than the width of postpedicel. Thorax black in brown pollen. Halteres yellow. Wings hyaline, with brownish tinge, without distinct darkening along veins. Legs completely black. Abdomen black. Epandrium from dorsal view widest closer to surstyli;

surstyli broadly rounded apically and bearing 4–5 stout spine-like bristles ( Fig. 2 ); aedeagus convex; gonites like rounded blade from lateral view ( Fig. 3 ). Body length 1.9 mm.

NOTES. The species of the genus Lamproscatella can be finally determined from male terminalia only. Mathis (1979) distinguished two groups with different shape of fifth tergum in dorsal view – subtriangular and subtrapezoid. L. aklavik according to such division was placed in the same group with L. bimaculata Hendel, 1933 . Some additional external characters may help to divide these two species: face coloration of L. aklavik is golden-brownish and in

L. bimaculata mainly whitish grey; stripes of black coloration on fronto-orbital plates in L.

aklavik longer; wings of L. aklavik not distinctly darkened along radial veins in comparison with L. bimaculata . L. aklavik has unique structure of male terminalia, due to 4–5 stout spine-like bristles at apex of surstyli; such bristles are unknown for other species of Lamproscatella .

The species is confined to areas with arctic, subarctic and sharply continental temperate climate.

DISTRIBUTION. Russia (Yakutia, Tuva), Canada (the Northwest Territories).

and surstyli, dorsal view; 3 – epandrium, surslyli and internal genital structures, lateral view.

Figures

Figs 1–3. Lamproscatella aklavik Mathis, ♂: 1 – head, dorsolateral view; 2 – epandrium