Tubeworm

noun, Zoology.
1.
any of various marine worms that produce and inhabit a tube, some being adapted to a hydrothermal vent environment.

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Tubi-
1. a combining form representing tube, in compound words: tubiform.
Tubicolous
adjective 1. living in a self-constructed tube, as a marine worm. adjective 1. (of certain invertebrate animals) living in a self-constructed tube
Tubifex
noun, plural tubifexes (especially collectively) tubifex. 1. any common, bottom-dwelling worm of the genus Tubifex, often used as food for aquarium fish. noun (pl) -fex, -fexes 1. any small reddish freshwater oligochaete worm of the genus Tubifex; it characteristically lives in a tube in sand and is used as food for aquarium fish