Nemedina acutiformis Carles-Tolra , 2008

Kanavalova, Liliana, Kubik, Stepan & Bartak, Miroslav, 2020, Two new West Palaearctic species of Atelestus Walker (Diptera, Atelestidae) and new distributional records of the family, ZooKeys 955, pp. 147-158 : 147

Nemedina acutiformis Carles-Tolra, 2008

Description.

Female (first description). Only characters different from description of the female of Nemedina alamirabilis as described by Chandler (1981) and Sinclair and Papp (2004) or not specified in those papers are mentioned here.

Eye with sparse and very short ommatrichia about as long as diameter of single facet. Frons broad, 0.14-0.15 mm at level of anterior ocellus, occupying 34-37% of head width, very sparsely microtrichose (best visible in dorsal view, frons almost subshiny in anterior view), covered with very short setulae (0.02-0.03 mm long) arranged in 3 irregular rows on each side (5-6 setulae in each row, outer rows continuing along eye margin up to vertex), leaving only narrow central area bare. Occiput and ocellar triangle covered with setulae about as long as those on frons. Gena medium wide (0.03 mm), lustrous. Thorax uniformly covered with short setulae and sparse microtrichiae. No apparent bare area between acrostichals and dorsocentrals. Notopleuron with 2-3 setae stronger, only slightly longer than surrounding setulae, postalar callus with 1 short seta, scutellum with 2-3 pairs of setae. Wing with anal vein almost complete and depigmented apically. Legs including coxae with very short setulae. Femora not compressed, fore tibia equally narrow. Hind tibia wider than hind femur. Abdomen microtrichose, only tergite 8 partly lustrous. Sternite 8 fully developed, hypoproct (sternite 10) present (Figs 5-7 ). Length of wing 1.3-1.5 mm.

Remarks.

Carles-Tolrá (2008) indicated two characters (beside genitalia) that distinguish males of N. acutiformis from N. alamirabilis : postpedicel ovate-conical and anal vein reaching wing margin. In fact both these characters are rather variable between our specimens of both species (males and females) and cannot be used as differentiating characters.

Figures

Figures 5 - 7. Nemedina acutiformis Carles-Tolra, 2008, female abdomen 5 in lateral view 6 dorsal view 7 ventral view.