Wiktionary
tubifex
n. Any member of the genus (taxlink Tubifex genus noshow=1) of tubificid annelids.
Wikipedia
Usage examples of "tubifex".
Ileana would think if she found out what a lump of tubifex worms my poem really was, and what to get her for her birthday.
Nevertheless, the oxygen-scarce water still contained many forms of life: water-lice, tubifex worms and blood worms.