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Sui generis

Latin phrase meaning in its own class

  • 9 min read
  • 5 chapters

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Through Species, Genre and Classification

Several disciplines use the term to refer to unique entities. These include:

  • Biology, for species that do not fit into a genus that includes other species (its own genus)
  • Creative arts, for artistic works that go beyond conventional genre boundaries (its own genre)
  • Law, when a special and unique interpretation of a case or authority is necessary (its own special case)
    • Intellectual property rights, for types of works not falling under general copyright law but protected through separate statutes
    • Laws of war, for types of actions that are argued to be legal due to exceptional circumstances in conflict
  • Philosophy, to indicate an idea, an entity, or a reality that cannot be reduced to a lower concept or included in a higher concept (its own category)

Biology

In the taxonomical structure "genus → species", a species is described as sui generis if its genus was created to classify it (i.e., its uniqueness at the time of classification merited the creation of a new genus, the sole member of which was initially the sui generis species). A species that is the sole extant member of its genus (e.g., the genus Homo) is not necessarily sui generis; extinctions may have eliminated other congeneric species. A sui generis genus may also be called a monotypic genus.

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