Terrestrial-migration
Guides
Desmona bethula
amphibious caddisfly
Desmona bethula, commonly known as the amphibious caddisfly, is a species of northern caddisfly in the family Limnephilidae. It is notable for its unusual terrestrial feeding migration behavior, in which fifth-instar larvae leave streams at night to feed on semiaquatic plants before returning to the water. This species is univoltine with autumn emergence and has been proposed as a potential evolutionary link between aquatic and secondarily terrestrial caddisfly lineages.