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)
- Archiacanthocephala
- Eoacanthocephala
- Palaeacanthocephala (ancient thornheads)
- Polyacanthocephala
Acoelomorpha (simple soft-bodied flatworms)
Annelida (segmented worms)
- Clitellata (earthworms)
- Polychaeta (bristle worms)
- Sipuncula (peanut worms)
Arthropoda (arthropods: insects, crustaceans, arachnids, centipedes, and millipedes)
Chelicerata[1]
- Arachnida (spiders, scorpions, and kin)
- Xiphosura (horseshoe crabs)
- Pycnogonida (sea spiders)
Crustacea[2]
- Branchiopoda (fairy shrimp, tadpole shrimp, water fleas, and clam shrimp)[3]
- Cephalocarida (horseshoe shrimp)[4]
- Pentastomida (tongue worms)
- Branchiura (fish lice)
- Mystacocarida
- Copepoda
- Ostracoda (seed shrimp)[5]
- Malacostraca (crabs, lobsters, crayfish, krill, various shrimp, woodlice, and kin)[6]
- Thecostraca (barnacles)
- Remipedia
Hexapoda[7]
- Entognatha (coneheads, two-pronged bristletails and springtails)
- Insecta (insects)
Myriapoda[8]
Brachiopoda ("lamp shells")
Bryozoa (moss animals)
Chaetognatha (arrow worms)
Chordata (vertebrates, tunicates, and lancelets)
Cephalochordata
- Leptocardii (lancelet)
Tunicata
- Appendicularia (larvaceans)
- Ascidiacea (sea squirts, paraphyletic with respect to Thaliacea)
- Thaliacea (salps, pyrosomes, and doliolids)
Vertebrata
Agnatha
Cyclostomata
- Myxini (hagfish)
- Petromyzontida (lamprey)
Gnathostomata
- Chondrichthyes (cartilaginous fish: chimeras, sharks and rays)
- Osteichthyes
- Actinopterygii (ray-finned fish, which includes most familiar bony fish)
- Sarcopterygii
Cnidaria (marine stinging animals)
- Octocorallia
- Hexacorallia
- Ceriantharia
- Cubozoa (box jellyfish)
- Hydrozoa (hydroids)
- Myxozoa (marine parasites)
- Scyphozoa (true jellyfish)
- Staurozoa (stalked jellyfish)
- Polypodiozoa (marine parasites)
Cycliophora (tiny marine animals)
Dicyemida (rhombozoa)
- Dicyemida
Echinodermata (starfish, sea urchins, sand dollars, sea lilies, and others)
Crinozoa
- Crinoidea (sea lilies and feather stars)
Asterozoa
- Asteroidea (star fish)
- Ophiuroidea (brittle stars)
Echinozoa
- Echinoidea (sea urchins)
- Holothuroidea (sea cucumbers)
Entoprocta
Gastrotricha (hairybacks)
Gnathostomulida (jaw worms)
Hemichordata
- Enteropneusta (acorn worms)
- Pterobranchia
Kinorhyncha (mud dragons)
Loricifera
Mollusca (mollusks)
- Aplacophora
- Bivalvia (clams, mussels, scallops, and kin)
- Cephalopoda (octopuses, squids and cuttlefish)
- Gastropoda (snails and slugs)
- Monoplacophora
- Polyplacophora (chitons, or sea cradles)
- Scaphopoda (tusk shells)
Micrognathozoa
Nematoda (roundworms)
Nematomorpha (horsehair worms)
Nemertea (ribbon worms)
Onychophora (velvet worms)
Orthonectida
Placozoa
Platyhelminthes (flatworms)
- Cestoda (tapeworms and relatives)
- Monogenea
- Trematoda (flukes)
- Turbellaria (e.g. Dugesia)
Porifera (sponges)
- Calcarea (calcareous sponges)
- Demospongiae
- Hexactinellida (glass sponges)
- Homoscleromorpha
Priapulida (priapulid worms)
Rotifera (rotifers)
Tardigrada (tardigrades, water bears, or moss piglets)
Xenoturbellida
References
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