List of animal classes

The following is a list of the classes in each phylum of the kingdom Animalia. There are 106 classes of animals in 24 phyla in this list (the phyla Entoprocta, Gastrotricha, Gnathostomulida, Loricifera, Micrognathozoa, Onychophora, Orthonectida and Phoronida contain no classes). 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.

Annelida (segmented worms)

• Polychaeta (bristle worms, paraphyletic with respect to Clitellata and Sipuncula)
• Clitellata (earthworms, leeches)
• Sipuncula (peanut worms)

Arthropoda (insects, crustaceans, arachnids, centipedes and others)

Chelicerata

Source:^[1]

• Arachnida (spiders, scorpions, and kin)
• Merostomata (horseshoe crabs)
• Pycnogonida (sea spiders)

Myriapoda

Source:^[2]

• Chilopoda (centipedes)
• Diplopoda (millipedes)
• Pauropoda
• Symphyla (pseudocentipedes)

Pancrustacea

Source:^[3]

• Ostracoda (seed shrimp)^[4]
• Mystacocarida
• Ichthyostraca (tongue worms and fish lice)
• Copepoda
• Malacostraca (crabs, lobsters, crayfish, krill, various shrimp, woodlice, and kin)^[5]
• Tantulocarida
• Thecostraca (barnacles)
• Cephalocarida (horseshoe shrimp)^[6]
• Branchiopoda (fairy shrimp, tadpole shrimp, water fleas, and clam shrimp)^[7]
• Remipedia

Hexapoda

Source:^[8]

• Entognatha (coneheads, two-pronged bristletails and springtails. paraphyletic with respect to insects)
• Insecta (insects)

Brachiopoda (lamp shells)

• Lingulata
• Craniata
• Rhynchonellata

Bryozoa (moss animals)

• Gymnolaemata
• Phylactolaemata
• Stenolaemata

Chaetognatha (arrow worms)

• Sagittoidea

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

Cyclostomata (jawless fish)

• Myxini (hagfish)
• Petromyzontida (lamprey)

Gnathostomata (jawed vertebrates)

• Chondrichthyes (cartilaginous fish: chimeras, sharks and rays)

• Osteichthyes
  • Actinopterygii (ray-finned fish, which includes most familiar bony fish)
  • Sarcopterygii
    • Actinistia (coelacanths)
    • Dipnoi (lungfish)
    • Tetrapoda
      • Amphibia (amphibians)
      • Amniota
        • Mammalia (mammals)
        • Aves (birds)
        • Reptilia (reptiles, paraphyletic with respect to Aves)

Cnidaria (marine stinging animals)

Anthozoa (corals and sea anemones)

• Octocorallia
• Hexacorallia

Medusozoa (jellyfish and hydrozoans)

• Cubozoa (box jellyfish)
• Hydrozoa (hydroids)
• Scyphozoa (true jellyfish)
• Staurozoa (stalked jellyfish)

Endocnidozoa (marine parasites)

• Myxozoa
• Polypodiozoa

Ctenophora (comb jellies)

• Tentaculata
• Nuda (beroids)

Cycliophora (tiny marine animals)

• Eucycliophora

Dicyemida (rhombozoa)

• Rhombozoa

Echinodermata (sea stars, sea urchins, sand dollars, sea lilies, and others)

Crinozoa

• Crinoidea (sea lilies and feather stars)

Asterozoa

• Asteroidea (sea star)
• Ophiuroidea (brittle stars)

Echinozoa

• Echinoidea (sea urchins)
• Holothuroidea (sea cucumbers)

Hemichordata

• Enteropneusta (acorn worms)
• Pterobranchia
• Planctosphaeroidea

Kinorhyncha (mud dragons)

• Allomalorhagida
• Cyclorhagida

Mollusca (mollusks)

• Solenogastres
• Caudofoveata
• Bivalvia (clams, cockles, mussels, oysters and scallops)
• Cephalopoda (octopuses, squids, cuttlefish and nautiluses)
• Gastropoda (snails and slugs)
• Monoplacophora
• Polyplacophora (chitons, or sea cradles)
• Scaphopoda (tusk shells)

Nematoda (roundworms)

• Chromadorea
• Enoplea

Nematomorpha (horsehair worms)

• Gordioida
• Nectonematoida

Nemertea (ribbon worms)

• Hoplonemertea
• Palaeonemertea
• Pilidiophora

Placozoa

• Polyplacotomia^[9]
• Uniplacotomia^[9]

Platyhelminthes (flatworms)

• Catenulida
• Turbellaria (e.g. Dugesia, paraphyletic with respect to Neodermata)

Neodermata (parasitic worms)

• Cestoda (tapeworms and relatives)
• Monogenea
• Trematoda (flukes)

Porifera (sponges)

• Calcarea (calcareous sponges)
• Demospongiae
• Hexactinellida (glass sponges)
• Homoscleromorpha

Priapulida (priapulid worms)

• Halicryptomorpha
• Priapulimorpha
• Seticoronaria

Rotifera (rotifers)

• Bdelloidea
• Monogononta
• Seisonidea

Acanthocephala (thorny-headed worms)

Source:^[10]

• Archiacanthocephala
• Eoacanthocephala
• Palaeacanthocephala (ancient thornheads)
• Polyacanthocephala

Tardigrada (tardigrades, water bears, or moss piglets)

• Eutardigrada
• Heterotardigrada

Xenacoelomorpha

• Xenoturbellida

Acoelomorpha (simple soft-bodied flat worms, paraphyletic)

• Acoela
• Nemertodermatida

References

1. ^ Integrated Taxonomic Information System. "ITIS Standard Report Page: Chelicerata". www.itis.gov
2. ^ "ITIS Standard Report Page: Myriapoda". www.itis.gov. Integrated Taxonomic Information System.
3. ^ Integrated Taxonomic Information System. "ITIS Standard Report Page: Crustacea". www.itis.gov
4. ^ "Archived copy". Archived from the original on 2013-05-12. Retrieved 2014-10-03.
5. ^ Conlan, Kathleen E. & Bousfield, Edward. "Malacostracan | crustacean". www.britannica.com
6. ^ "Archived copy". Archived from the original on 2014-10-06. Retrieved 2014-10-03.
7. ^ Regents of the University of California. "Introduction to Brachiopoda". www.ucmp.berkeley.edu
8. ^ "ITIS Standard Report Page: Hexapoda". www.itis.gov. Integrated Taxonomic Information System.
9. ^ Tessler, Michael; Neumann, Johannes S.; Kamm, Kai; Osigus, Hans-Jürgen; Eshel, Gil; Narechania, Apurva; Burns, John A.; DeSalle, Rob; Schierwater, Bernd (2022-12-08). "Phylogenomics and the first higher taxonomy of Placozoa, an ancient and enigmatic animal phylum". Frontiers in Ecology and Evolution. 10. doi:10.3389/fevo.2022.1016357
10. ^ Shimek, Ronald (January 2006). "Nano-Animals, Part I: Rotifers". Reefkeeping.com. Retrieved July 27, 2008.