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Should taxonomy terms such as Crustacea be capitalized? I think yes, but am unsure.

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The word Crustacea is a proper noun in English, yes. –  tchrist Nov 29 '12 at 17:22
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up vote 14 down vote accepted

It depends on which level of taxonomy that term is. For genus and higher, names are capitalized. Species and terms more specific than species (like variety and subspecies) are not capitalized.

Thus, for your example, Crustacea should be capitalized because it is a subphylum.

More details can be found here.

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"I don't eat mammals, but poultry." Does "mammals" need to be capitalized? –  Blessed Geek Nov 29 '12 at 16:53
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@Blessed Geek The taxonomic name of the group of mammals is Mammalia. The former is not capitalized, the latter is. –  Mark Beadles Nov 29 '12 at 16:55
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Moreover, genus and species (and subspecies, if any) are to be set in italic, but higher taxa should be set in roman. –  tchrist Nov 29 '12 at 17:21
    
Upvote for proper plural of taxon by @tchrist. –  Malvolio Nov 29 '12 at 21:49
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