Stephan Balleux – Sui generis

Sui generis is a Latin expression, literally meaning of its own kind/genus or unique in its characteristics. The expression is often used in analytic philosophy to indicate an idea, an entity, or a reality which cannot be included in a wider concept.
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In the taxonomical structure “genus species” a species that heads its own genus is known as sui generis. This does not mean, however, that all genera with only a single member are composed of sui generis species. It is only if the genus was specifically created to refer to that one species, with no other known examples, that the species is sui generis. If the species is alone merely due to extinction, as in the case of the Homo genus, the surviving species is not sui generis, because other members of the genus are known, even if they are not currently extant.
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In law, it is a term of art used to identify a legal classification that exists independently of other categorizations because of its uniqueness or due to the specific creation of an entitlement or obligation.

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