Worm

Any of various unrelated invertebrate animals that typically have soft, slender, elongated bodies and usually lack appendages. Worms are members of several invertebrate phyla, including Platyhelminthes (flatworms), Annelida (segmented worms), Nemertea (ribbon worms), Aschelminthes (roundworms, pinworms, eelworms, threadworms, hairworms, etc.), Sipuncula (peanutworms),