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fossil taxon
taxon described on the basis of fossil material
Extinct taxon
biological taxon with no living specimens
Paraphyletic group
in cladistic analysis, an ancestral species and some, but not all, of its descendants
Monotypic taxon
Taxonomic group with only one subordinate taxon
Evolutionary grade
Non-monophyletic grouping of organisms united by morphological or physiological characteristics
Strain (biology)
Genetic variant, subtype or culture within a biological species
Candidatus
Indication in bacteriological nomenclature
Incertae sedis
Term to indicate an uncertain taxonomic position
cosmopolitan taxon
ecological concept
