cladogenesis

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clad·o·gen·e·sis

 (klăd′ə-jĕn′ĭ-sĭs)
n.
An evolutionary process that involves the splitting off or branching of new taxa from an ancestral form.

[Greek klados, branch + -genesis.]

clad′o·ge·net′ic (-jə-nĕt′ĭk) adj.
clad′o·ge·net′i·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

cladogenesis

(ˌklædəˈdʒɛnəsɪs)
n
(Biology) adaptive evolution leading to a greater variety of species
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014