- a team of very lowly arranged, wormlike parasites, like the Dicyemata. They're found in cephalopods. See dicyemata.
- A provisional major division of animals, considered intermediate between the Protozoa in addition to Metazoa, and based upon the figures associated with the Dicyemida alone. These creatures don't have any mesoderm. yet develop metazoic embryos bv epiboly.