| Term | Definition |
| Porifera | Sponges "pore". Usually a bumpy or sheet-like growth on other objects, with a spongy or gritty feel to it. |
| Cnidaria | Stinging Animals. Hollow-bodied animals with stinging cells for catching food and for protection. |
| Mollusca | soft bodied animals. Many of these animals protect their soft bodies with hard shells. |
| Echinoderm | Spiny skinned animals. Animals with bodies arranged in five parts, and with "tube feet." |
| Arthropods | jointed legged animals. Animals with exoskeletons and jointed legs. |
| Bryozoa | Moss animals. Very tiny animals found in colonies. Although often common, they are usually overlooked. |
| Marine Worms | There are actually several phyla of worms that occur in tidepools. |
| Algae | Most marine animals belong to one of three phyla of this: Green, Red, and Brown. |
| Flowering Plants | These plants have true leaves, roots, and stems. These are the most common plants on land, but they are rare in the sea. |
| Vertebrata | Animals with backbones. There are two major groups of these found at tidepools - birds and fishes. |
| Tunicata | Sea squirts. These unusual animals arte distantly related to backboned animals. |