Incertae sedis

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(abbreviation ''i. s.'') From Latin "uncertain seating", ''incertae sedis'' is a term used in [[taxonomy]] and [[phylogenetics]] to indicate a taxon with an uncertain position. For instance, [[Myxozoa]] might be referred to as [[Animalia]] ''incertae sedis''. This uncertainty may existon two levels - it may be uncertain whether the organism is truly a member of the higher taxon, or it may be reasonably certain that the organism does belong to the taxon, but its phylogenetic position relative to other members of the taxon might be problematic. Some authors restrict the use of ''incertae sedis'' to the first level of uncertainty, and refer to the second by the phrase ''sedis mutabilis'' (Latin "changeable seating").
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(abbreviation ''i. s.'') From Latin "uncertain seating", ''incertae sedis'' is a term used in [[taxonomy]] and [[phylogenetics]] to indicate a taxon with an uncertain position. For instance, [[Myxozoa]] might be referred to as [[Animalia]] ''incertae sedis''. This uncertainty may exist on two levels - it may be uncertain whether the organism is truly a member of the higher taxon, or it may be reasonably certain that the organism does belong to the taxon, but its phylogenetic position relative to other members of the taxon might be problematic. Some authors restrict the use of ''incertae sedis'' to the first level of uncertainty, and refer to the second by the phrase ''sedis mutabilis'' (Latin "changeable seating").

Revision as of 19:36, 5 November 2006

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