Extant taxon

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In biology, extant taxa (singular, taxon), such as species, genera and families, are taxa still in existence, meaning still alive as opposed to extinct. For example, the moose is an extant species, while the dodo is an extinct species. Likewise, in the group of molluscs known as the cephalopods, as of 1987 there were approximately 600 extant species and 7,500 extinct species.[1]

A taxon can become extinct from extant if all the living species died. On the other hand, an extinct taxon can also become extant, provided that there are new discovery of extant species, or new extant species are added to the taxon.


  1. ^ Barnes, Robert D. (1987). Invertebrate Zoology (5th ed.). Philadelphia: Saunders College Publishing. ISBN 0-03-008914-X.