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The second highest ranking of animals in the standard scientific taxonomy, referred to as 'Division" in the case of , and . There was no "phylum" in the original ; the word was introduced by . A Phylum is the taxonomic category between and . A phylum is a major ranking of organisms, defined according to the most basic body-parts shared by that group. e.g. (animals with a - vertebrates and others), (animals with a jointed ) (animals with a rasping and shell-secreting ), (flowering plants), and so on. Some traditional Phyla like the are invalid ().
The operational meaning of phylum is more illuminated if we consider that a "typical" phylum is a group of organisms of uncertain (or problematic) taxonomic affinities (see Bengtson, 1986).
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Bengtson, S. (1986) The problem of the Problematica. In Problematic Fossil Taxa, Vol. 5 (Eds, Hoffman, A. & Nitecki, M.H.) Oxford U. P., N.Y., & Clarendon, Oxford, pp. 3-11.
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