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'''''Sui generis''''' (/ˌsuːiˈdʒɛnərɪs/, roughly "SOO-ee JEN-a-ris", Latin pronunciation: ˌsui ge'neris/ ) is a Neo-[[Latin]] expression, literally meaning ''of its own kind/'' or [[unique]] in its characteristics.[http://dictionary.reference.com/wordoftheday/archive/2001/06/14.html]
'''''Sui generis''''' (/ˌsuːiˈdʒɛnərɪs/, roughly "SOO-ee JEN-a-ris", Latin pronunciation: ˌsui ge'neris/ ) is a Neo-[[Latin]] expression, literally meaning ''of its own kind/'' or [[unique]] in its characteristics.[https://dictionary.reference.com/wordoftheday/archive/2001/06/14.html]
The expression was effectively created by scholastic [[philosophy]] to indicate an [[idea]], an entity or a [[reality]] that cannot be included in a wider concept. In the 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.
The expression was effectively created by scholastic [[philosophy]] to indicate an [[idea]], an entity or a [[reality]] that cannot be included in a wider concept. In the 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.