List of animal classes

The following is a list of the classes in each phylum of the kingdom Animalia. There are 108 classes of animals in 34 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.

Incertae sedis

Micrognathozoa

Acanthocephala (thorny-headed worms)

Acoelomorpha (simple soft-bodied flatworms)

Annelida (segmented worms)

Aelosomata^[1]
Clitellata (earthworms)
Myzostomida
Polychaeta
Echiura

Arthropoda (arthropods: insects, crustaceans, arachnids, centipedes, and millipedes)

Chelicerata^[2]

Arachnida (spiders, scorpions, and kin)
Xiphosura (horseshoe crabs; only 4 extant species)
Pycnogonida (sea spiders)

Crustacea^[3]

Branchiopoda (fairy shrimp, tadpole shrimp, water fleas, and clam shrimp)^[4]
Cephalocarida (horseshoe shrimp; only 12 described species)^[5]
Malacostraca (crabs, lobsters, crayfish, krill, various shrimp, woodlice, and kin)^[6]
Maxillopoda (barnacles, copepods, fish lice, and other groups)^[7]
Ostracoda (seed shrimp)^[8]
Remipedia (no common name)

Hexapoda^[9]

Protura (coneheads)
Diplura (two-pronged bristletails)
Collembola (springtails)
Insecta (insects)

Myriapoda^[10]

Chilopoda (centipedes)
Diplopoda (millipedes)
Pauropoda (no common name)
Symphyla (pseudocentipedes)

Brachiopoda (brachiopods aka lamp shells)

Bryozoa (moss animals)

Chaetognatha (arrow worms)

Archisagittoidea
Sagittoidea

Chordata (vertebrates, tunicates, and lancelets)

Cephalochordata

Leptocardii (lancelet)

Tunicata

Appendicularia (larvaceans)
Ascidiacea (sea squirts)
Sorberacea (no common name)
Thaliacea (salps, pyrosomes, and doliolids)

Vertebrata

Agnatha

Cyclostomata

Myxini (hagfish)
Petromyzontida (lamprey)

Gnathostomata

Chondrichthyes (cartilaginous fish, mostly sharks and rays)

Tetrapoda

Amphibia

Amniota

Mammalia (mammals)
Aves (birds)
Reptilia (reptiles)

Osteichthyes

Actinopterygii (ray-finned fish, which includes most familiar bony fish)
Sarcopterygii (lobe-finned fish)

Cnidaria (jellyfish, corals, anemones, and others)

Anthozoa (corals and anemones)
Cubozoa (box jellyfish)
Hydrozoa (hydroids and others)
Malacosporea
Myxosporea
Scyphozoa (true jellyfish)
Staurozoa (stalked jellyfish)
Polypodiozoa

Cycliophora (tiny marine animals)

Eucycliophora

Dicyemida (rhombozoan mesozoans)

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

Entoprocta

Gastrotricha

Gastrotricha

Gnathostomulida

Gnathostomulida

Hemichordata

Kinorhyncha

Kinorhyncha

Loricifera

Loricifera

Mollusca

Bivalvia (clams, mussels, scallops, and kin)
Caudofoveata
Cephalopoda (octopuses - see Octopus#Etymology and pluralization)
Gastropoda (snails and slugs)
Monoplacophora
Polyplacophora
Scaphopoda
Solenogastres

Nematoda

Nematomorpha

Gordioidea
Nectonematoida

Nemertea

Onychophora (velvet worms)

Udeonychophora

Orthonectida

Orthonectida

Placozoa

Trichoplacoidea

Platyhelminthes (flatworms)

Cestoda show characteristics of both cestodes and tremoteds
Monogenea
Trematoda flukes e.g. Clonorchis sinensis, Fasciola hepatica, schistosomes
Turbellaria e.g. Dugesia

Porifera (sponges)

Priapulida

Rotifera (rotifers)

Sipuncula (peanut worms)

Tardigrada (tardigrades, water bears, or moss piglets)

Xenoturbellida

Xenoturbellida

References

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