The embryo produced directly from the egg in a metagenetic series, especially the larva of a tapeworm or other parasitic worm. See Illust. of Echinococcus.

The "head" of a tapeworm parasite, armed with hooks or suckers and used for attachment and locomotion.

The head of a tapeworm that attaches to the intestinal wall.

One of the Scolecida.