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In biology, an extant species is a living species, as contrasted with an extinct species. The term 'extant' can also be used to describe higher groups, such as genera or families, that are still in existence (living).
- Barnes, Robert D. 1982. Invertebrate zoology. Holt-Saunders, Philadelphia PA. pp945–946 ISBN 0-03-056747-5
- http://www.iucn.org/themes/ssc/red_list_2004/GSAexecsumm_EN.htm .