Simulium angustipes agg.


One of a group of four species in the subgenus Eusimulium likely to be encountered in Britain with S.angustipes being the most likely to occur in VC55. The members of this group can be very difficult to identify and sometimes they can only be reliably separated by testing DNA – for this reason we have decided to treat this group as an aggregate for the purposes of this website. They are small  stout-bodied biting flies.

Similar Species

Of the four British species, S.aureum and S.angustipes appear to be the most widespread, with S. aureum being more upland in habitat. S.velutinum appears to be confined to Wales and the Welsh borders, while S.petricolum as a species in Britain is probably confined to Sussex.

Identification difficulty

Various habitats but especially at water margins.

When to see it

Spring and summer.

Life History

They have aquatic larvae. Adults suck the blood of birds as well as humans and other mammals.

UK Status

Little recorded but probably fairly frequent in Britain.

VC55 Status

Little recorded but probably fairly frequent in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map