Species Account for Cryptonevra nigritarsis

Essex Red Data List comment
Recorded from 4 out of 57x10km.sq. records in county

Species text
Cryptonevra nigritarsis is a poorly known species, and probably under-recorded to some extent. There are over ten post-1960 sites. Although known from few sites it will probably prove to be more widespread; unlike related species it is often recorded from single specimens. It is probably most easily recorded by collecting damaged Phragmites stems and rearing adults. The fly occurs in Phragmites stands, usually those with a saline influence (but also inland fens such as Wicken (Cambridgeshire) and the Cothill fens (Oxfordshire). Most sites are coastal and an inland Yorkshire site has had saline flooding in the past. Management should maintain a reasonably high water level in wetlands and ensure good stands of Phragmites. Use rotational ditch or pond management to maintain continuity of suitable habitat and prevent the natural silting up of water bodies, but avoid dredging the whole bank at once so as to preserve continuity of Phragmites stands (Ismay, status review in prep.). References

Habitats

Recorded management for locations with Cryptonevra nigritarsis

Recorded substrate and hydrology for locations with Cryptonevra nigritarsis

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