Jan Hamrsky / Alderfly larva (Sialis lutaria: Megaloptera) tracheal gills detail. Czech Republic. Controlled conditions.

Jan Hamrsky / Alderfly larva (Sialis lutaria: Megaloptera). Czech Republic. Controlled conditions.

Simon Colmer / Alder fly (Sialis lutaria) West Sussex, UK

Simon Colmer / Alder fly (Sialis lutaria) West Sussex, UK

Simon Colmer / Alder fly (Sialis lutaria) West Sussex, UK

Jan Hamrsky / Alder Fly (Sialis lutaria) larva ventral view. Europe, September.

Jan Hamrsky / Alder Fly (Sialis lutaria) larva. Europe, September.

Kim Taylor / Alder Fly (Sialis lutaria) in profile against a white background. Surrey, UK, April.

Nick Upton / Alder fly (Sialis lutaria) resting on Angelica stem on river bank, Wiltshire, UK, May

PREMAPHOTOS / Alder fly female {Sialis lutaria} laying eggs on Rush stem, UK, Note - Two tiny parasitic wasps {Trichogramma semblidis} are ovipositing in the Alder fly eggs

PREMAPHOTOS / Alder fly {Sialis lutaria} female laying eggs on Juncus, UK

PREMAPHOTOS / Alder fly {Sialis lutaria} UK

PREMAPHOTOS / Alder fly female {Sialis lutaria} laying eggs on leaf, while a tiny parasitic wasp {Trichogramma semblidis} lays her eggs into a nearby batch of eggs, UK

Adrian Davies / Alder fly {Sialis lutaria} laying eggs on twig England, UK