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A group composed of an ancestor and all of its descendants, no matter how much they may differ in for from the ancestral condition [1].

References[]

  1. ^ Holtz, Dr. Thomas Jr.; Luis V. Rey (2007). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages. Random House. ISBN 9780375824197.  Cite uses deprecated parameter |coauthor= (help)
Anatomy of an amiotic egg This article is part of Project Glossary, an All Birds project that aims to write comprehensive articles on each term related to animals.


Hemipus picatus This article is part of Project Taxonomy, an All Birds project that aims to write comprehensive articles on each taxonomic term.
File:File:CollapsedtreeLabels-simplified.svg This article is part of Project Phylogenetics, a All Birds project that aims to write comprehensive articles on each phylogenetic term.
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