Prodiamesa olivacea

Author: (Meigen, 1818)

Exuviae 6.8-10.4mm long (m=8.8mm, n=28) (033-1.jpg).
Cephalothorax: Thoracic horn 395-685µm long (m=546µm, n=27) (033b.jpg). ThR 3.0-6.9 (m=4.6, n=27).
Abdomen: Segment II with obvious pedes spurii B. Armament of abdominal tergites less extensive; on segment VIII restricted to antero-lateral corners. Segment VIII not laterally projecting to the rear. Abdominal segments without lateral fringe. Lateral taeniae of segments VII and VIII: 4, 5; not branched.
Anal segment: Anal lobe ratio 1.3-1.6 (m=1.5, n=21). Fringe of anal lobe with 49-80 taeniae (m=61, n=28). Anal lobes rounded, with four macrosetae. Anal lobe with only the four seta-bearing tubercles near apex (033c.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 586: Prodiamesinae 4 Prodiamesa of the Text Key.

Holarctic species: widespread in Europe and circum-Mediterranean.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Lakes, ponds, rivers and drains.
Larvae in coarse/fine sediments, somewhat coldstenotherm (Janecek, 1999a).