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 exceptional uniqueness at the time of classification necessitated the creation of a new genus, the sole member of which was initially the sui generis species). A species that is the lone extant member of its genus (e.g. the Homo genus) is not necessarily sui generis: extinction processes may have eliminated any number of species for which the genus was created.
Read more about this topic: Sui Generis
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