Anasimyia lineata (Fabricius, 1787)
Helophilus lineatus Fabricius in Coe (1953).
Biology & ecology:
The larva is of the "long-tailed" type. They may be found in eutrophic wetlands in rotting plant debris just below the surface. Typical sites support emergent plants such as Great Reedmace Typha latifolia, Reed Sweet Grass Glyceria maxima and Branched Burr-reed Sparganium erectum, including Typha filled roadside ditches). Adults are most frequently found amongst marginal vegetation where they visit the flowers of buttercups Ranunculus (several species), Marsh Marigold Caltha palustris and other wetland plants such as Water Plantain Alisma plantago-aquatica.
Primarily a lowland species that primarily occurs within river valleys and coastal marshes. It is found throughout mainland Britain but is much scarcer in northern areas.
Status & conservation:
In common with others in this genus, there has been a very strong downward trend in the occurrence since the 1980s.