Conchapelopia pallidula

Author: (Meigen, 1818)

Exuviae 5.3-6.6mm long (m=6.0mm, n=16).
Cephalothorax: Thoracic horn 310-410µm long (m=373µm, n=16); ThR 1.6-2.5 (m=2.1, n=15). Plastron plate surrounded by an obvious clear rim; horn atrium narrow until close with its connection to the plastron plate (016f.jpg). Plastron plate 125x75-240x135µm. Rim 175x100-245x135µm. Plastron plate length 0.36-0.61 of horn length (m=0.50, n=13). Thorax tuberculate to the anterior margin. Anterior thoracic granulation extending as far back as the thorax comb. Thorax comb reduced to large rounded or pointed tubercles.
Abdomen: Armament of simple and forked spinules only. Armament of tergite VIII continuous across mid-line. Anterior lateral taenia of segment VII at 0.47-0.63 of length segment VII (m=0.55, n=16) (016g.jpg). Anterior lateral taenia of segment VIII at 0.46-0.55 of length segment VIII (m=0.51, n=17).
Anal segment: Anal lobe ratio 1.9-2.2 (n=15). Insertion of anterior anal taenia at 0.38-0.47 of lobe length (m=0.44, n=17).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 63: Tanypodinae 49 Conchapelopia of the Text Key.
Note: Conchapelopia trifascia (Freeman) will run here. It differs from pallidula in having tergite spinules restricted to Rheopelopia pattern in otherwise tuberculate armament. (Michiels and Spies, 2002a)

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

Ecological notes
Streams and fast flowing rivers.