peanut worm

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Noun1.peanut worm - small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut
invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification
phylum Sipuncula, Sipuncula - peanut worms
References in periodicals archive ?
Brachiopods, peanut worms and some other kind of marine worms have purple blood.
Vargas (1987, 1988) also listed the presence of peanut worms (Sipuncula), Glottidia audebarti (Broderip, 1835) lamp shells (Brachiopoda) and acorn worms (Enteropneusta).
On July 6, October 2, and December 15, 2015, peanut worms (S.