Anasimyia interpuncta

Anasimyia interpuncta (Harris, 1776)

Nomenclature:

This species was confused with A. lunulata before the review by Claussen & Torp (1980); older records are therefore suspect unless a specimen has been re-examined.

Biology & ecology:

Many records are associated with beds of Reed Sweet Grass Glyceria maxima growing in ditches on grazing marsh or levels around large, lowland rivers and on coastal marshes. Adults have been found visiting yellow flowers, such as Marsh Marigold Caltha paulustris and other buttercups, close to such beds. Adults fly rather early in the year, in April to early May, but a smaller, second flight period sometimes occurs July.

Distribution:

Mainly found in East Anglia, especially in the Norfolk Broads and the washes and flood plains of the main rivers such as the Nene and Great Ouse, but also in the Thames Marshes in Essex and the Pevensey Levels area of Sussex. It has recently been discovered in the Somerset Levels.

Status & conservation:

Vulnerable (RDB2) according to Shirt(1987) revised to Rare (RDB3) by Falk (1991) and LOWER RISK (Nationally scarce) by Ball & Morris (2014). A rather scarce species, although it may be overlooked because of its early flight period. It is usually only encountered in small numbers even where it is known to occur. There has been a downward trend in occurrence since the 1980s.

Recorded from 31 hectads since 1990.