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Incertae sedis—"of uncertain position (seat)"—is a term used to define a taxonomic group where its broader relationships are unknown or undefined. Taxonomy is the practice and science of classification The word comes from the Greek, taxis (meaning 'order' 'arrangement' and, nomos

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Examples

The taxonomy for humans is usually recognized as follows:

If modern humans were newly discovered or considered to be a taxonomic enigma, they might be given the rank of incertae sedis. In biological Taxonomy, a kingdom or regnum is a Taxonomic rank in either (historically the highest rank or (in the new three-domain system A phylum ( Plural: phyla) is a Taxonomic rank between Kingdom and above Class. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates A class is the Taxonomic rank in the Biological classification of organisms in Biology below phylum and above order. Mammals ( class Mammalia) are a class of Vertebrate Animals characterized by the presence of Sweat glands, including sweat glands This article is about the taxonomic rank for the sequence of species in a taxonomic list see Taxonomic order In scientific classification used A primate is a member of the biological order Primates ( Latin: "prime first rank" the group that contains Lemurs the Aye-aye Family denotes a group of People affiliated by consanguinity affinity or co-residence In Biological classification, family ( Latin Homininae is a subfamily of Hominidae, including Humans and some extinct relatives as well as the Gorillas and the Chimpanzees It comprises A tribe, viewed historically or developmentally consists of a Social group existing before the development of or outside of States Many anthropologists use Hominini is the tribe of Homininae that comprises humans ( Homo) Chimpanzees ( Pan) and their Extinct ancestors In Biology, a tribe &mdashor infrafamily&mdashis a Taxonomic rank between family and Genus. The more Anthropomorphic Primates of the Hominini tribe are placed in the Hominina subtribe The Genus Australopithecus ( Latin australis "of the south" Greek πίθηκος pithekos "ape" A genus (plural genera from Γένος Latin genus "descent family type gender" is a low-level Taxonomic Homo is the Genus that includes modern humans and their close relatives Homo erectus ( Latin: "upright man" is an extinct species of the genus Homo, believed to have been the first hominin Human beings, humans or man (Origin 1590–1600 L homō man OL hemō the earthly one (see Humus For example, if it were uncertain how Homo related to other members of the family Hominidae, a list of the great apes would look like this:

Likewise, if humans were known to be primates, but no other relationships were clear, a taxonomy of the primates would look like this:

Reasons a group might be considered incertae sedis

Not included in an analysis

If a formal phylogenetic analysis is conducted that does not include a certain taxon, the authors might choose to label the taxon incertae sedis instead of guessing as to its placement. This is particularly common when molecular phylogenies are generated since tissue for many rare organisms is hard to obtain. It is also a common scenario when fossil taxa are included since many fossils are defined based on partial information. FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system. For example, if the phylogeny was constructed using soft tissue and vertebrae as principal characters and the taxon in question is only known from a single tooth, it would be necessary to label it incertae sedis. A vertebra (plural vertebrae) is an individual Irregular bone in the spinal or Vertebral column ( aka ischis a flexuous and flexible column

Controversy

If conflicting results exist or if there is not a consensus among researchers as to how a taxon relates to other organisms, it may be listed as incertae sedis until the conflict is resolved.

Basal taxa

There is a growing trend (see phylogenetic taxonomy) among taxonomists to place a basal taxon in the clade that contains its ancestors, but to refrain from giving it any more specific taxonomic ranks. Phylogenetic nomenclature (PN is an alternative to rank-based nomenclature. Taxonomy is the practice and science of classification The word comes from the Greek, taxis (meaning 'order' 'arrangement' and, nomos In Phylogenetics, a basal Clade is the earliest clade to branch in a larger clade it appears at the base of a cladogram A taxon (plural taxa) or taxonomic unit, is a name designating an organism or a group of Organisms In Biological nomenclature according to A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor An ancestor is a Parent or ( recursively) the parent of an ancestor (i For example, the ancestor to all primates would be placed in the Order Primates, but would not be placed in a family at all. A primate is a member of the biological order Primates ( Latin: "prime first rank" the group that contains Lemurs the Aye-aye In Biological classification, family ( Latin Placing it in an individual family (such as Lemuridae) would suggest that it is more closely related to members of that family (lemurs) than to other primates when, in fact, it is equally related to all primates. Lemuridae is a family of Prosimian Primates native to Madagascar, and one of four families commonly known as Lemurs These animals

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