The eight major taxonomic units in order are: Domain, Kingdom, Phylum, Class, Order, Family, Genus and Species. These are further broken down into Kingdom, Subkingdom, Infrakingdom, Phylum, Subphylum, Infraphylum, Superclass, Class, Subclass, Infraclass, Order, Suborder, Family, Subfamily, Genus and Species. For example, the common cat is Animalia, Bilateria, Deuterostomia, Chordata, Vertebrata, Gnathostomata, Tetrapoda, Mammalia, Theria, Eutheria, Carnivora, Feliformia, Felidae, Felinae, Felis, and finally Felis cactus.
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