Leptopa Zetterstedt, 1838

Ozerov, A. L. & Krivosheina, M. G., 2023, Contribution to the fauna of dung flies (Diptera: Scathophagidae) of Russia with a key to genera and a checklist of the Russian Scathophagidae, Russian Entomological Journal 32 (1), pp. 95-122 : 108

Genus Leptopa Zetterstedt, 1838

Figs 3, 15, 63, 85, 86, 116.

DIAGNOSIS. Medium-sized flies (4–5 mm long). Palpus short, noticeably shorter than proboscis, with strong apical seta about as long as or longer than palpus (Fig. 3). Proepisternum bare without hairs at middle or in anterior part. Anepisternum covered with setulae usually along dorsal margin and in posterior part only, without setulae posterior to anterior spiracle. Katepisternum with one strong seta in upper posterior corner. Postmetacoxal bridge absent. Fore tibia ventrally covered with hairs, without spinules forming rows.

REMARKS. One species of Leptopa is known in the Palearctic — Leptopa filiformis Zetterstedt, 1838 . In this paper, we also consider species of the genus Parallelomma Strobl, 1894 in the genus Leptopa .

The description of the genus Parallelomma was given by Becker [1894]. In the same paper, Becker cites the differences between Parallelomma and Leptopa . However, Becker mistakenly believed that L. filiformis does not have a long seta on the palpus, while it is present in this species. Therefore, if we use the key proposed by Becker [ Becker, 1894: 85, 86] to determine genera, given the fact that L. filiformis has seta on the palpus, then L. filiformis enters into the genus Parallelomma . All other characters indicated by Becker for the genus Parallelomma also correspond to Leptopa . L. filiformis has enlarged vibrissal angle with a row of centrally directed setae and postgena with strong setae ( Fig. 15 ), which distinguishes this species from Parallelomma species. We attribute these characters to the characters of the species rank and therefore propose to include the species Parallelomma in the genus Leptopa , and the name Parallelomma Strobl, 1894 is considered a new junior synonym of Leptopa Zetterstedt, 1838 .

Figures

Figs 13–18. Head of Scathophagidae, lateral view: 13 — Delina nigrita (Fallén); 14 — Hexamitocera loxocerata (Fallén); 15 — Leptopa filiformis (Zetterstedt); 16 — Megaphthalma pallida (Fallén); 17 — Micropselapha filiformis (Zetterstedt); 18 — Mixocordylura parva Ozerov. 14 — after Ozerov & Krivosheina, 2015, fig. 3; 17 — after Ozerov, 2014, fig. 7; 18 — after Ozerov & Krivosheina, 2012a, fig. 10. Рис. 13–18. Голова Scathophagidae, сбоку: 13 — Delina nigrita (Fallén); 14 — Hexamitocera loxocerata (Fallén); 15 — Leptopa filiformis (Zetterstedt); 16 — Megaphthalma pallida (Fallén); 17 — Micropselapha filiformis (Zetterstedt); 18 — Mixocordylura parva Ozerov. 14 — по Ozerov & Krivosheina, 2015, fig. 3; 17 — по Ozerov, 2014, fig. 7; 18 — по Ozerov & Krivosheina, 2012a, fig. 10.