Wikipedia
( Latin for "of uncertain placement") is a term used for a taxonomic group where its 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 (of uncertain family), (of uncertain suborder), (of uncertain order) and similar terms.
Several genera of tussock moths in the Erebidae family are placed in Incertae sedis (of uncertain position) because their relationships to tribes within the Lymantriinae subfamily are unclear.
Several genera of the Arctiini tribe of tiger moths are placed as Incertae sedis due to the uncertainty of their phylogenetic relationships within the tribe.
Several genera of the Lithosiini tribe of lichen moths are placed as Incertae sedis due to the uncertainty of their phylogenetic relationships within the tribe.