Ephydra Fallén, 1810

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 : 346-348

Genus Ephydra Fallén, 1810

Ephydra Fallén, 1810: 22 (feminine). Type species: Ephydra riparia Fallén, 1813 , designated by Curtis, 1832.

DIAGNOSIS. Medium-sized flies, body length 4– 5.5 mm; face prominently convex and pubescent, oral margin with setae; 3 (rarely 4) lateroclinate fronto-orbital and 5 (2+3) dorsocentral setae; claws straight; pulvilli not developed.

DESCRIPTION. Shiny bluish-green metallic or more or less matt pollinose species with broad head and small eyes.

Head. Face strongly swollen with vertical lower portion, covered with hairs, oral margin with a row of strong vertical setae; clypeus hidden ( Figs 1, 2 ). Frons flat, frontal vitta shiny metallic, with a pair of cruciate strong or weak interfrontal setae; 3–4 pairs of lateroclinate fronto-orbital, 1 pair of ocellar, pairs of strong outer vertical and inner vertical setae; postocular setae well developed ( Fig. 1 ) or short and thin ( Fig. 2 ). Antenna blackish, greyish dusted; arista short (very short) pubescent ( Fig. 2 ) or pectinate on dorsal surface ( Fig. 6 ).

1 2 3 4

Thorax black, pollinose. Acrostichals setulose in many irregular rows at least in front of transverse suture ( Fig. 4 ) or in two distinct rows ( Fig. 3 ), dorsocentrals 2+3, intra-alars (0–2)+(0–2), supra-alars 2+1, postpronotal 1, notopleurals 2, postalars 2. Scutellum black, pollinose, with two pairs of strong setae. Anepisternum with 1 strong seta and a row of long hairs on posterir margin. Katepisternum with 1 strong seta in upper posterior corner.

Wing clear, with brownish tinge, without spots ( Fig. 5 ). Calypters, margins of calypters and halteres yellow.

Abdomen black, pollinose. Structures of male terminalia considerably modified depending on species group (see below).

Figures

Figs 1–4. Head, lateral view (1, 2) and scutum (3, 4) of Ephydra spp.: 1, 3 — E. glauca Meigen; 2 — E. sholtzi Becker; 4 — E. riparia Fallén. Рис. 1–4. Голова, сбоку (1, 2) и среднеспинка (3, 4) Ephydra spp.: 1, 3 — E. glauca Meigen; 2 — E. sholtzi Becker; 4 — E. riparia Fallén.

Figs 5–6. Wing of Ephydra riparia Fallén (5) and antenna of Ephydra pseudomurina Krivosheina, lateral view (6). Рис. 5–6. Крыло Ephydra riparia Fallén (5) и усик Ephydra pseudomurina Krivosheina, сбоку (6).