Zavrelimyia melanura

Author: (Meigen, 1804)

Diagnosis (n=7, unless stated otherwise)
Exuviae 4.9-5.9mm long (024-1.jpg).
Cephalothorax: Thoracic horn 345-425µm long, curved shortly after the base, more or less parallel-sided or widened towards apex, toothed; ThR 3.9-5.8. Plastron plate offset at horn apex, with a clear rim, plate 25-45x15-30µm; length 0.07-0.13x horn length, 2.5-4.5x width neck (n=11), 0.37-0.72x maximum width rim (n=15). Atrium of thoracic horn not reduced, thin-walled, at most a little undulate marginally, width 0.59-0.77x horn width. (024b.jpg)
Abdomen: Abdominal tergites with a pale area each side of mid-line. Tergite and sternite VIII with extensive shagreen, covering much, or all, the tergite. Pleura of tergites III-V with spinulation extending over most of the segment length. Anterior lateral taenia of segment VII at 0.36-0.48 of length segment VII (n=6). Anterior lateral taenia of segment VIII at 0.25-0.32 of length segment VIII (n=6).
Anal segment: Anal lobes toothed strongly both externally beyond the lateral taeniae and internally, both margins convexly narrowed to apex. Anal lobe ratio 2.9-3.7. Insertion of anterior anal taenia at 0.21-0.41 of lobe length. (024c.jpg)
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 99: Tanypodinae 85 Zavrelimyia of the Text Key.

Widespread in Europe and NW Africa.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Northern and montane lakes, pools and streams.