List of animal classes

The following is a list of the classes in each phylum of the kingdom Animalia. There are 105 classes of animals in 24 phyla in this list (the phyla Entoprocta, Gastrotricha, Gnathostomulida, Loricifera, Micrognathozoa, Onychophora, Orthonectida and Phoronida contain no classes, nor does the subphylum Xenoturbellida). 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:

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

Myriapoda

Source:

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

Pancrustacea

Source:

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

Hexapoda

Source:

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

Brachiopoda (lamp shells)

Bryozoa (moss animals)

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)

Medusozoa (jellyfish and hydrozoans)

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

Endocnidozoa (marine parasites)

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

Kinorhyncha (mud dragons)

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)

Nematomorpha (horsehair worms)

Nemertea (ribbon worms)

Placozoa

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)

Rotifera (rotifers)

Acanthocephala (thorny-headed worms)

Source:

Archiacanthocephala
Eoacanthocephala
Palaeacanthocephala (ancient thornheads)
Polyacanthocephala

Tardigrada (tardigrades, water bears, or moss piglets)

Xenacoelomorpha

Acoelomorpha (simple soft-bodied flat worms)

References

↑ Integrated Taxonomic Information System. "ITIS Standard Report Page: Chelicerata". www.itis.gov.
↑ "ITIS Standard Report Page: Myriapoda". www.itis.gov. Integrated Taxonomic Information System.
↑ Integrated Taxonomic Information System. "ITIS Standard Report Page: Crustacea". www.itis.gov.
↑ "Archived copy" (PDF). Archived from the original (PDF) on 2013-05-12. Retrieved 2014-10-03.{{cite web}}: CS1 maint: archived copy as title (link)
↑ Conlan, Kathleen E.; Bousfield, Edward. "Malacostracan | crustacean". www.britannica.com.
↑ "Archived copy" (PDF). Archived from the original (PDF) on 2014-10-06. Retrieved 2014-10-03.{{cite web}}: CS1 maint: archived copy as title (link)
↑ Regents of the University of California. "Introduction to Brachiopoda". www.ucmp.berkeley.edu.
↑ "ITIS Standard Report Page: Hexapoda". www.itis.gov. Integrated Taxonomic Information System.
1 2 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.
↑ Shimek, Ronald (January 2006). "Nano-Animals, Part I: Rotifers". Reefkeeping.com. Retrieved July 27, 2008.

[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" (PDF). Archived from the original (PDF) on 2013-05-12. Retrieved 2014-10-03.{{cite web}}: CS1 maint: archived copy as title (link)

[5] Conlan, Kathleen E.; Bousfield, Edward. "Malacostracan | crustacean". www.britannica.com.

[6] "Archived copy" (PDF). Archived from the original (PDF) on 2014-10-06. Retrieved 2014-10-03.{{cite web}}: CS1 maint: archived copy as title (link)

[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.

[Tessler-9] 1 2 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.

[shimek-10] Shimek, Ronald (January 2006). "Nano-Animals, Part I: Rotifers". Reefkeeping.com. Retrieved July 27, 2008.