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  1. Neontology

    Neontology is a part of biology that, in contrast to paleontology, deals with living (or, more generally, recent) organisms. It is the study of extant taxa (singular: extant taxon): taxa (such as species, genera and families) with members still alive, as opposed to (all) being extinct.
    www.wikiwand.com/en/Neontology
    www.wikiwand.com/en/Neontology
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    A taxon can be classified as extinct if it is broadly agreed or certified that no members of the group are still alive. Conversely, an extinct taxon can be reclassified as extant if there are new discoveries of living species ("Lazarus species"), or if previously known extant species are reclassified as members of the taxon.
    en.wikipedia.org
    Taxon A and taxon B are sister groups to each other. Taxa A and B, together with any other extant or extinct descendants of their most recent common ancestor (MRCA), [Note 1] form a monophyletic group, the clade AB. Clade AB and taxon C are also sister groups. Taxa A, B, and C, together with all other descendants of their MRCA form the clade ABC.
    en.wikipedia.org
    No extant taxon is closer to the root than any other. A basal group in the stricter sense forms a sister group to the rest of the larger clade, [citation needed] as in the following case:
    It is the study of extant taxa (singular: extant taxon ): taxa (such as species, genera and families) with members still alive, as opposed to (all) being extinct. For example: The moose ( Alces alces) is an extant species, and the Irish elk ( Megaloceros giganteus) is an extinct species.
    en.wikipedia.org
  3. Sister group - Wikipedia

  4. Extant Taxon - an overview | ScienceDirect Topics

  5. Neontology - Wikiwand

  6. Constant taxon - Wikipedia