Ephemera vulgata is characterised by spotted wings and dark triangular markings on the sides of it’s abdomen.
The adults emerge in spring and early summer near ponds and slow moving rivers. It is found along the River Thames where nymphs burrow into the muddy sediments. In contrast, the similar Ephemera dancia, or the ‘Green drake‘, is typically associated with clear water rivers with gravel or sandy bottoms.
Although not uncommon, Ephemera vulgata is in decline with documented threats including reductions in water quality (increasing pesticides and heavy metals) and light pollution.