RowenaM's picture

Medium to large, blue fly

Observed: 5th May 2012 By: RowenaM

A fly, at least 2cm long, with a bright blue shiny abdomen (light blue)and black head and thorax, drowned in a puddle in riverside woodland.

Species interactions

No interactions present.

Species with which St Marks Fly (Bibio marci) interacts


Martin Harvey's picture


There's a lot of life in that puddle! As well as the St Mark's Fly there is a water cricket (one of the Velia species) to the left of the photo, as well as lots of other fly larvae in the water.

Entomologist and biological recorder