Identification: Thorax: Much of the thorax dusted so as to appear grey, except humeri which are black & undusted, Head: Long palpi
Antennae: Pedicel (2nd antennal segment) dark, blackish brown. Wing: infuscated (rarely evident in photographs)
Males: A metathoracic process ("rudder") projecting between the hind coxae (arrowed in Image 2)
Size: Larger species than C. stylifera. Wing length 5.5 - 7.4 mm
Europe: Countries (2018 ) (Sumner, 2018), online at Fauna Europaea, Occurrences at GBIF
UK: Recording Scheme map of occurrences 2016 (verified.) Online (NBN Atlas) via Easy maps or Interactive Atlas
The distance between the apices of Sc and R1 is several times the length of ta; An is short, does not reach the edge of the wing. In males between the posterior cokes have a short, split at the apex of the outgrowth, the outgrowth of the abdominal sternite 5 as in Calobata; there are no outgrowths on S3 & S4.
Very little known. Adults occur in wet forests on vegetation along creeks and rivers and larvae are presumably saprophagous in leaf litter. (Jindřich Roháček, 1990)