| Term | Definition |
| platyhelminthes | triploblastic and acelomates |
| platyhelminthes classes | turbullana, trematoda, cestoda |
| turbullana | nonparasidic, free living |
| trematoda | most parasidic, reduced digestive |
| cestoda | all parasidic, no digestive |
| porifera classes | calcurea, hexatinellidae, demospogae |
| calcurea | calcium carbonate spicules |
| hexatinellidae | glass spicules |
| demospongae | no spicules |
| cnidaria classes | scyphozoa, cubozoa, anthozoa, hyrozoa |
| scyphozoa | jellyfish-->medusa adult jellyfish |
| cubozoa | box jelly-->medusa adult |
| anthozoa | no medusa-->polyp adult anemones, corals |
| hydrozoa | polyp adult portugese man-of-war |
| ctenophora | no classes bioluminescint, colloblasts |