Aquatic Invertebrates of Montana
Eiseniella tetraedra (Savigny)
A large, thick-bodied aquatic worm with a thick clitellum on segments 22 through 27 or maybe a couple less until fully mature. The body beyond the clitellum is fairly square. Like all lumbricids, there is a well-formed gizzard at the beginning of the intestine.
This is a small earthworm, being just about big enough to get on a fish hook, which makes it one our biggest aquatic oligochaetes. Montana specimens frequently reach about 45 mm long and about 2 mm wide.
It is a widespread species, at least in North America.
24 DEC 1996, D.L. Gustafson
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