cladistics

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Related to Sister taxa: Artificial classification, Sister taxon

cladistics

(klə-dĭs′tĭks)
n. (used with a sing. verb)
A system of classification based on the presumed phylogenetic relationships and evolutionary history of groups of organisms.

cla·dis′tic, cla·dis′ti·cal adj.
cla·dis′ti·cal·ly adv.

cladistics

an approach to CLASSIFICATION by which organisms are ordered and ranked entirely on a basis which reflects recent origin from a common ancestor, i.e. like a family tree. The system is concerned simply with the branching of the tree and not with the degree of difference. The latter is the concern of evolutionary taxonomists who oppose the cladistic approach.
References in periodicals archive ?
Because each of the six pairs of sister taxa are descended from the same WT individual, they can be assembled to form any of 15 possible four-taxon phylogenies.
parallelus (i.e., genetic variation among sister taxa, but little interpopulation variation; i.e., song characters appear to be multigenic).
Annelida and Arthropoda are not sister taxa: a phylogenetic analysis of spiralian metazoan phylogeny.
For example comparing evolutionary rates in two terminal sister taxa, A and B, is easy (e.g., see hypothetical case in [ILLUSTRATION FOR FIGURE 2 OMITTED]; one simply compares the total evolution values from each of the phylograms ([TE.sub.A] - [TE.sub.B]).
florinii as sister taxa on another branch, and a remaining branch including Ortesia, Moyliostrobus, Ernestiodendron, and Walchiostrobus gothanii.
We would be a lot more upset if you had fish and humans coming out as sister taxa than if you had changes within mammals.
(1992) have characterized a DNA satellite unique to these two species, providing further evidence of their sister taxa status.
We find that both character sets, analyzed separately or simultaneously, support the monophyly of a major clade that consists of the Pooideae, the PACC clade (as sister taxa), and a series of less inclusive taxa that are often placed within the Bambusoideae but here are placed within one or the other of these two major groups; the larger clade that includes Pooideae and the PACC clade is itself nested among tribes that are often assigned to Bambusoideae.
collybita, trochilus]) that are themselves not sister taxa [ILLUSTRATION FOR FIGURES 3, 4 OMITTED].
Studies of taxonomy and morphological variation in darters have revealed allopatrically distributed sister taxa for several species, suggesting that vicariant events have been a major force in the evolution of the group (Mayden 1988).
Although the evolution of body size has undoubtedly played a major role in the history of these fishes, we are interested in comparing the magnitudes of morphometric variation between sister taxa that are largely or entirely free of variation due to overall size.