Polychaetes are a type of marine worm. They are usually around 4 inches long, and have a vast range of colors, from blue to orange! They have pairs of parapodium, which act as paddles for movement! There are over 10,000 different species of polychaetes.


Mollusks are a type of invertebrate species. It is a broad branch name for small creatures, many of whom have shells! An example of one is a snail, a squid or even an octopus.  


Echinoderms are most commonly characterized by having radial symmetry, like a starfish! They are found at every ocean depth and are free-swimming organisms. Examples would be starfish, sea urchins, and sand dollars!


Cnidaria is a type of species of marine mammal, in which there are over 10,000 types! Commonly represented by the jellyfish, they are made of a nonliving jelly substance called mesoglea. They eat krill and other tiny organisms to survive.


Arthropods are a type of invertebrate species with an exoskeleton. Exoskeleton means that their skeletal system is on the outside of their body. Some examples of these are crabs, small crustaceans, and even butterflies!