Alderfly

Scientific Name: 

Sialis lutaria

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Description

Easily recognised by its smoky wings, which have relatively few veins; these are dark and widely-spaced and do not fork at the tips. The adults, usually seen resting on waterside objects, rarely feed. They fly weakly when disturbed. The rather feathery, aquatic larva is highly predatory.

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Length: 

15-20mm

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Distribution: 

most of Europe

Habitat: 

edges of ponds and slow-moving streams

Diet: 

rarely feeds, but may nibble on algae and pollen grains.

Status: 

Common and widespread

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Species: 

S. lutaria

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