Introduction to the Aschelminth Phyla  A very large and heterogeneous cluster of animals have traditionally been classified together in a group variously known as the Aschelminthes, Nemathelminthes, and/or Pseudocoelomata. Today, these organisms are classified in about ten separate phyla. Nonetheless, it is sometimes useful to...

rotacanth  Advances in morphological and molecular studies of metazoan evolution have led to a better understanding of the relationships among rotifers (Monogononta, Bdelloidea and Seisonidea) and acanthocephalans, and their relationships to other bilateral animals. The most accepted morphological analysis places Acanthocephala...