| kingdom animalia | eukaryotic, multicellular; heterotrophic |
| Phylum Cnidaria | stinging tentacled animals; radially symmetrical; two cell layers; mout surrounded by stinging tentacles; nerve network |
| Phylum Cnidaria | coral, hydra, jelly |
| Phylum Porifera | sessile; two cell layers; porous bodies |
| Phylum Porifera | sponge |
| Phylum Platyhelminthes | flatworms; motile; bilaterally symmetrical; three cell layers; gut with one opening; many parasitic |
| Phylum Platyhelminthes | tape worm (parasitic), planarian |
| Phylum Nematoda | roundworms; motile, bilaterally symmetrical; cylindrical body; two openings many parasitic |
| Phylum Nematoda | hookworm, fliaria worm |
| Phylum Rotifera | rotifers; mostly motile; bilaterally symmetrical; cilia form a wheel around mouth |
| Phylum Rotifera | rotifers |
| Phylum Chelicerata | two body parts; jointed appendages; chitinous exoskeleton; no wings; lack antennae; lungs and gills |
| Phylum Chelicerata | Class Merostomata; Class Arachnida |
| Class Arachnida | spiders; tick; scorpion |
| Phylum Crustacea | two body parts; two pairs of antennae on the head; aquatic |
| Phylum Crustacea | crab, shrimp, lobster |
| Phylum Mandibulata | insects, millipedes, centipedes; three body parts; three pairs of legs; one/two pairs of wings; gas exchange through trachea |
| Phylum Mandibulata | Class Hexapoda and Class Myriapoda |
| Class Hexapoda | terrestrial, one pair of antennae, one/two pairs of wings; three pairs of legs; trachea |
| Phylum Annelida | segmented worms; motile bilaterally symmetrical; body internally and externally segmented |
| Phylum Annelida | leech, earth worm |