The alderfly is fairly uncommon. It is in Group Two Taxa, which means it is somewhat sensitive to pollution. These are some characteristics that will help you distinguish the alderfly from other macroinvertebrate. They develop over a period of one to three years. They are very large, and can grow up to one inch long.
Alderflies have no gill tufts and a smooth underside.
Alderflies have one branched tail filament extending straight back. They may be light colored. They are carnivorous and may possibly bite. Habitat Alderfly larvae can live in standing or moving water. Many species like quiet waters or pools where debris has accumulated on the soft bottoms.