Terrestrial members of this phylum hold their eggs in a glandular sac called a clitellum and though they are hermaphroditic, usually must make contact with another individual to reproduce.
One class in this phylum consists of tiny flat and round members that are exclusively parasites of crinoids, the Myzostomida. Another class, the Hirudinea, has its coelom filled with spongy tissue reducing a normally open space into a series of narrow canals. Another class of this phylum consists of marine creatures that possess hundreds of chitin bristles and some can be found living in self-secreted tubes in deep-sea vents. Terrestrial members of this phylum hold their eggs in a glandular sac called a clitellum and though they are hermaphroditic, usually must make contact with another individual to reproduce. Named after the many ring-like structures found on their bodies, for 10 points, identify this phylum of segmented worms that includes leeches and earthworms.
One class in this phylum consists of tiny flat and round members that are exclusively parasites of crinoids, the Myzostomida.
{Annelida} or Annelids or segmented worms (before stated)