sister group(s) [sister-group(s)]
Glossary of "Life (9th ed.)" by Sadava et al. (2011)
- Two phylogenetic groups that are each other 's closest relatives.
Glossary of "Cladistics (2nd ed.)" by Kitching et al. (1998)
- (1) Two taxa that are more closely related to each other than either is to a third taxon. (2) The taxon that is genealogically most closely related to the ingroup.
"Phylogenetics" by Wiley (1981), p. 7
- A sister group is a species or a higher monophyletic taxon that is hypothesized to be the closest generalogical relative of a given taxon exclusive of the ancestral species of both taxa. Thus, when we say that two taxa are sister groups, we mean that they are hypothesized to share an ancestral species not shared by any other taxon.
- Kitching, I. J., Forey, P. L. Humphries, C. J. & Williams, D. M. 1998. Cladistics, 2nd ed.: the Theory and Practice of Parsimony Analysis. -xii + 228 pp. Oxford University Press, New York.
- Sadava, D., Hillis, D. M., Heller, H. C. & Berenbaum, M. R. 2011. Life: The Science of Biology, 9th ed. -xliv + 1266 pp. Sinauer Associates, Inc., Sunderland.
- Wiley, E. O. 1981. Phylogenetics: the Theory and Practice of Phylogenetic Systematics. -xv + 439 pp. John Wiley & Sons, Inc., New York.