Though there are more than 20,000 different types of annelids, the main kinds are earthworms, leeches, and sea worms. Th... MoreAnnelids: Earthworms, Leeches, and Sea Worms
Mollusks are one of the largest groups of invertebrates, with about 100,000 types in the world. The main kinds are snail... MoreMollusks: Snails, Clams, and Their Relatives
Cephalopods are one group of mollusks, and there are about 650 different types of cephalopods. The main types are octopu... MoreCephalopod: Octopuses, Squids, and Their Relatives
Echinoderms are a group of invertebrate animals that live in the sea. There are about 6,000 kinds of echinoderms, with t... MoreEchinoderms: Sea Stars, Sea Urchins, and Their Relatives
The main kinds of myriapods are centipedes and millipedes, pauropods, and symphylans. All told, there are 14,000 types o... MoreMyriapods: Centipedes, Millipedes, and Their Relatives
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