Incertae sedis
Term to indicate an uncertain taxonomic position
Incertae sedis
Incertae sedis (Latin for 'of uncertain placement') or problematica is a term used for a taxonomic group whose broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertainty at specific taxonomic levels is indicated by incertae familiae (of uncertain family), incerti subordinis (of uncertain suborder), incerti ordinis (of uncertain order) and similar terms.
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