Answer: flatworms

AnswerCrossword Clue
FLATWORMSPlanarians and liver flukes
FLATWORMSSome parasites
flatwormsA worm of a phylum that includes the planarians together with the parasitic flukes and tapeworms. They are distinguished by having a simple flattened body that lacks blood vessels, and a digestive tract that, if present, has a single opening
flatwormsFLATWORM, a flat-bodied worm