What are the most common animal phyla?

Animals in General Read more from
Chapter Aquatic and Land Animal Diversity

Scientists often categorize animal phyla into about thirty-five divisions—whether they are found in the oceans, on land, or in between. The nine major phyla include Porifera (sponges), Cnidaria (hydra and jellyfish), Mollusca (mollusks), Echinodermata (starfish and sea urchins), Nematoda (roundworms), Annelida (segmented worms), Platyhelminthes (flatworms), Arthropoda (insects, crustaceans, and arachnids), and Chordata (fish, amphibians, reptiles, birds, and mammals).


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