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Sialis lutaria, common name alderfly, is a species of alderfly belonging to the order Megaloptera family Sialidae. Biolib
The flat larvae reach approximately .Macan, T. T. (1959) A guide to freshwater invertebrate animals. Longmans, Green & Co Ltd., London. They have large heads, powerful jaws and three pairs of legs. Furthermore, they show feathery gills on the abdominal segments. The abdomen terminates with a long gill.
Females lay a large quantity of eggs on plants overhanging the waters, where larvae will fall after hatching. Larvae are aquatic predators of small invertebrates and usually wait for their prey in silt or under stones just emerging from the water. The life cycle in this species lasts about one-two years, but the adults live two-three days only, without feeding.O'Tool, C. (2002) The new encyclopedia of insects and their allies. Oxford University Press, Oxford.Giani, N., & Laville, H. (1973, January). Cycle biologique et production de Sialis lutaria L.(Megaloptera) dans le lac de Port-Bielh (Pyrenees Centrales). In Annales de Limnologie-International Journal of Limnology (Vol. 9, No. 1, pp. 45-61). EDP Sciences
Biology
Adults are most often encountered from May through June on vegetation near slow-flowing streams or close to ponds. They are bad fliers and never leave the waters where the larvae have developed.
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