The animals in the Annelida are segmented worms. They have no legs, and no hard skeleton. Unlike mollusks, annelid bodies are divided into many little segments, like rings joined together. There are many other kinds of worms, but only annelids are segmented this way. There are three main groups of annelids, the earthworms (and their relatives), the leeches , and a big group that lives in the ocean and are called polychaetes (pol-ee-keets). We only have information about earthworms and leeches in the Critter Catalog.