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The following is a list of the classes in each phylum of the kingdom Animalia. There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla. For example, Protura, Diplura, and Collembola are often considered to be the three orders in the class Entognatha. This list should by no means be considered complete and authoritative and should be used carefully.
Acanthocephala (thorny-headed worms)
Acoelomorpha (simple soft-bodied flatworms)
Annelida (segmented worms)
Arthropoda (arthropods: insects, crustaceans, arachnids, centipedes, and millipedes)
- Arachnida (spiders, scorpions, and kin)
- Xiphosura (horseshoe crabs; only 4 extant species)
- Pycnogonida (sea spiders)
- Branchiopoda (fairy shrimp, tadpole shrimp, water fleas, and clam shrimp)
- Cephalocarida (horseshoe shrimp; only 12 described species)
- Malacostraca (crabs, lobsters, crayfish, krill, various shrimp, woodlice, and kin)f
- Maxillopoda (barnacles, copepods, fish lice, and other groups)
- Ostracoda (seed shrimp)
Brachiopoda ("lamp shells")
Bryozoa (moss animals)
Chaetognatha (arrow worms)
Chordata (vertebrates, tunicates, and lancelets)
- Leptocardii (lancelet)
- Appendicularia (larvaceans)
- Ascidiacea (sea squirts)
- Thaliacea (salps, pyrosomes, and doliolids)
- Chondrichthyes (cartilaginous fish, mostly sharks and rays)
- Actinopterygii (ray-finned fish, which includes most familiar bony fish)
- Sarcopterygii (lobe-finned fish)
Cnidaria (marine stinging animals)
- Anthozoa (anemones and corals)
- Cubozoa (box jellyfish)
- Hydrozoa (hydroids)
- Malacosporea (marine parasites)
- Myxosporea (marine parasites)
- Scyphozoa (true jellyfish)
- Staurozoa (stalked jellyfish)
- Polypodiozoa (marine parasites)
Cycliophora (tiny marine animals)
Echinodermata (starfish, sea urchins, sand dollars, sea lilies, and others)
- Crinoidea (sea lilies and feather stars)
Gnathostomulida (jaw worms)
Kinorhyncha (mud dragons)
- Bivalvia (clams, mussels, scallops, and kin)
- Cephalopoda (octopuses, squids and cuttlefish)
- Gastropoda (snails and slugs)
- Polyplacophora (chitons, or sea cradles)
- Scaphopoda (tusk shells)
Nematomorpha (horsehair worms)
Nemertea (ribbon worms)
Onychophora (velvet worms)
Priapulida (priapulid worms)
Tardigrada (tardigrades, water bears, or moss piglets)
- Integrated Taxonomic Information System. "ITIS Standard Report Page: Chelicerata". www.itis.gov.
- Integrated Taxonomic Information System. "ITIS Standard Report Page: Crustacea". www.itis.gov.
- Regents of the University of California. "Introduction to Brachiopoda". www.ucmp.berkeley.edu.
- "Archived copy" (PDF). Archived from the original (PDF) on 2014-10-06. Retrieved 2014-10-03.CS1 maint: archived copy as title (link)
- Conlan, Kathleen E.; Bousfield, Edward. "Malacostracan | crustacean". www.britannica.com.
- "ITIS Standard Report Page: Hexapoda". www.itis.gov. Integrated Taxonomic Information System.
- "ITIS Standard Report Page: Myriapoda". www.itis.gov. Integrated Taxonomic Information System.