Animal Taxonomy

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This taxonomy is based on the ITIS Hierarchical Report, which is managed by government agencies in the US, Canada, and Mexico, with input from other sources.

Infrakingdom: Deuterostomia

Animals for whom, in embryonic development, the first opening becomes the anus

Phylum: Chordata

Animals with a notochord, a flexible rod made out of a cartilage-like material

Subphylum: Vertebrata

Superclass: Tetrapoda

• Class: Amphibia (Amphibians)
• Class: Reptilia (Reptiles)
• Class: Aves (Birds)
• Class: Mammalia (Mammals)

Infrakingdom: Protostomia

Animals for whom, in embryonic development, the first opening becomes the mouth

Superphylum: Ecdysozoa

Animals with a three-layered cuticle (four in Tardigrada), which is periodically molted as the animal grows. They lack locomotory cilia and produce mostly amoeboid sperm, and their embryos do not undergo spiral cleavage.

Phylum: Arthropoda (insects, spiders, etc.)

Invertebrate animals with an exoskeleton, a segmented body, and paired appendages

Subphylum: Chelicerata

• Class: Arachnida (Spiders)

Subphylum: Crustacea

• Class: Malacostraca (crayfish, pillbugs)

Subphylum: Hexapoda

• Class: Insecta (Insects)

Subphylum: Myriapoda (myriapods)

• Class: Diplopoda (millipedes)

Superphylum: Lophozoa

Phylum: Annelida

Animals with long bodies and segments divided externally by shallow ring-like constrictions called annuli and internally by septa ("partitions") at the same points, but missing in a few species. Most segments have the same sets of organs but a common gut, circulatory system and nervous system. Their bodies are covered by a cuticle that is secreted by cells in the skin and does not molt.

Subphylum: Clitellata

• Class: Oligochaeta (Earthworms)

Phylum: Mollusca

• Class: Gastropoda (Snails)