| Term | Definition |
| Porifera (Calcarea and Silicea) | Phylum of sponges |
| Cnidarians | phylum of jellyfish, corals, and hydras |
| Hydrozoa, scyphozoa, Cubozoa, anthozoa | 4 classes of Cnidaria |
| Platyhelminthes | phylum of flatworms |
| Turbellaria, monogenea, tremotada, cestoda | 4 classes of Platyhelminthes |
| Mollusca | phylum of clams, snails, squids, oysters, and octopuses |
| polyplacophora, gastropoda, bivalvia, cephalopoda | 4 classes of Mollusca |
| Annelida | phylum of segmented worms |
| hirudinea, oligochaeta, polychaeta | 3 classes of Annelida |
| Arthropoda | phylum of crustaceans, insects, and spiders |
| cheliceriforms, myriapoda, hexapoda, crustacea | 4 subphylums of arthropoda |
| Echinodermata | phylum of sea stars and sea urchins |
| asteroidea, ophiuroidea, echinoidea, crinoidea, holothuroidea, concentricycloidea | 6 classes of Echinodermata |