Class Examples
| 1. Porifera | |
| a. Class Calcerea | calcareous sponges |
| b. Class Hexactinellida | glass sponges |
| c. Class Demospongiae | bath sponges |
| . | |
| 2. Cnidaria | |
| a. Class Scyphozoa | true jellyfish |
| b. Class Anthozoa | |
| b1. hard body type | coral |
| b2. soft body type | sea anenome |
| c. Class Hydrozoa [polymorph] | |
| c1. polyp form | hydra |
| c2. medusa form | gonio-nemus |
| c3. colonial form | o-belio |
| . | |
| 3. Platyhelminthes | |
| a. Class Turbellaria | flatworms (free living) |
| b. Class Monogenea | flukes |
| c. Class Trematoda | flukes |
| c. Class Cestoda | tapeworms |
| . | |
| 4. Nematoda | |
| a. Ascarius lumbriocoides | roundworm |
| c. C. elegans | a soil nematode used extensively in DNA research |
| . | |
| 5. Annelida | |
| a. Class Polychaeta | clamworms |
| b. Class Oligochaeta | earthworms |
| c. Class Hirudinea | leeches |
| . |
| Kingdom Protista [no classes here, only the phylums] | |
| 1. Phylum Sarcomastigophora | amoeba |
| 2. Phylum Ciliaphora | paramecium |
| 3. Phylum Apicomplexa | sporozoans (malaria parasite) |