all are parasitic, mostly in the digestive systems of vertebrates.
They range in size from 1 millimeter to over 15 meters. None have digestive tracts - all are parasitic, mostly in the digestive systems of vertebrates. The general body pattern is bilaterally symmetrical and consists of a head, or scolex, which uses a sucker and hooks to attach to the host, and body segments, known as proglottids, which produce gametes. FTP identify the colloquial name of this class of creatures, in phylum Platyhelminthes, class Cestoda.
They range in size from 1 millimeter to over 15 meters. None have digestive tracts -
{tapeworm}