caddisfly larva; caddis worm
Refers to the aquatic larva of the caddisfly, known for building protective cases from sand, stones, or plant material. Also called 飛螻蛄 (とびけら) for the adult insect.
See also: トビケラ
When I turned over a stone on the riverbed, a caddis worm was attached to it.
Caddis worms build cases out of small stones and sand.
Refers to the adult caddisfly, while いさごむし specifically denotes the larval stage.
Standard kanji spelling for the caddisfly larva.
Alternate kanji spelling; less common than 石蚕.
The derivation is uncertain. The kanji 石蚕 literally means 'stone silkworm', likely referring to the larva's stone-like case.