Siphlonurus lacustris is a species of mayfly in the Siphlonuridae family.

This species is widespread in Britain, inhabiting mountain streams. This species has a grey abdomen, with darker markings and two tails. There are several wavy veinlets which run back from the last vein on the hind margin of the forewing. There are several similar species.
Siphlonurus lacustris TL

When Siphlonurus lacustris is active

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