Anasimyia lunulata (Meigen, 1822)
This species was confused with A. interpuncta before the review by Claussen & Torp (1980); older records are therefore suspect unless a specimen has been re-examined.
Biology & ecology:
The larva is of the long-tailed' type and lives principally in more acid localities than is typical for other members of the genus including valley bogs and cut-over bogs where vegetation is regenerating. It is possible that sites with some base influence are preferred and this might account for the restricted distribution of this species. Adults are rarely found far from the water's edge and are flower visitors.
Primarily a western and northern species which is particularly well-known from peatlands in western Wales where it can be abundant. There are also scattered records from South Uist, Cheshire, Devon, Dorset and the New Forest. Old records from eastern Britain including East Anglia but some of these may involve confusion with A. interpuncta. The population at Thursley Common (Surrey) is believed to be extinct.
Status & conservation:
Notable according to Falk (1991) and LOWER RISK (Nationally Scarce) according to Ball & Morris (2014). The large peak in frequency in the late 1980s was due to the Welsh Peatland Invertebrate Survey. There appears to have been little subsequent recording in suitable localities.