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1. Of or relating to a group of taxa that includes the common ancestor of all the members as well as all descendants of that ancestor.
2. Of or derived from one stock or source.

mon′o·phy·let′ic·al·ly adv.
mon′o·phy′ly (mŏn′ə-fī′lē, mə-nŏf′ə-lē) 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.


1. (Biology) relating to or characterized by descent from a single ancestral group of animals or plants
2. (Biology) (of animals or plants) of or belonging to a single stock
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Our results suggest the genus Aleixus should be included in a monophyletic group that shares three non-ambiguous derived characters (Fig.
Phylogenetic analyses of mitochondrial DNA sequences led us to conclude, provisionally, that each subfamily was monophyletic and that most tribes, as listed in the Orthoptera Species File 2, or OSF2 (Eades et al.
This subfamily is considered to be a monophyletic group distinguished by the presence of a row of anterodorsal spines on the fore tibia and a double node in the ovipositor apex (Hanson and Gauld, 2006).
The molgulid ascidians are a monophyletic group of tunicates that share specific morphological features, including a heart/kidney complex and hermaphroditic gonads found on both sides of the adult.
The genus Rhopalothrix Mayr is a member of the monophyletic tribe Basicerotini (Bolton 1998).
Towards a monophyletic Notholaena (Pteridaceae): resolving patterns of evolutionary convergence in xeric-adapted ferns.
Cladists attempt to create monophyletic groupings, ones that include ancestral taxa and all of the descendants.
Remarks.--According to Sissom (2000), Vaejovis is the largest genus of North American scorpions with approximately 70 species, but it is not monophyletic. It is currently divided into five species groups (see Sissom 2000) which in turn may or may not be monophyletic, plus a number of "unplaced" species.
Preliminary analyses of the COI data set suggest that Floridian Geolycosa are a monophyletic assemblage.