Nemertea

Ne·mer·tea | \ nə̇ˈmərtēə \

Definition of Nemertea

: a class or other category of Platyhelminthes comprising soft-bodied often brightly colored unsegmented acoelomate worms that have an anterior mouth and posterior anus, a long eversible proboscis, and a definite circulatory system, are typically elongate and contractile, and are usually marine and littoral and burrow in sand or mud though a few live in fresh water or on land — see anopla , enopla