Scolecida is a subclass of polychaete worm. Scolecids are mostly unselective deposit feeders on marine detritus. ==Characteristics== Scolecids have parapodia with rami that are all alike. The prostomium is distinct. The head has no appendages or palps and is usually conical, though in the Scalibregmatidae, it has a `T`-shaped tip, and in Paraoni.....
• (n. pl.) Same as Helminthes.
Sco·le'ci·da noun plural [ New Latin See Scolex .] (Zoology) Same as Helminthes . 
scolecida A large group worms including a vast number of species, most of which are parasitic.