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 (spē′shē-ā′shən, -sē-)
The formation of new biological species through the process of evolution.

spe′ci·ate′ v.
spe′ci·a′tion·al adj.


(Biology) relating to speciation
References in periodicals archive ?
2005: Speciational history of Australian grass finches (Poephila) inferred from 30 gene trees.
For instance, it has been suggested that hummingbirds are more common at high elevations [15] and this may lead to a speciational pollinator shift accompanied by the transition towards reddish flowers at high elevations.
Speciational history in a diverse clade of habitat-specialized spiders (Araneae: Nesticidae: Nesticus): Inferences from geographic-based sampling.
Speciational history in a diverse clade of habitat-specialised spiders (Aranae: Nesticidae: Nesticus): inferences from geographic based sampling.
1994), studies of monophyletic groups characterized by explosive speciation and adaptive radiation have had considerable impacts on ecological, evolutionary, and speciational theory (Echelle and Kornfield 1984).
To address questions about the speciational history of Appalachian Nesticus I have gathered nuclear and mitochondrial DNA sequences for a geographically comprehensive set of populations representing 28 species.
This kind of phylogenetic distance assumes a model of speciational evolution, with morphological and ecological change occurring primarily at speciation.
(1989) claimed their allozyme data supported such a process of "speciational evolution." However, Sanderson (1990) pointed out that when using Mindell's methods, it is impossible to distinguish real speciational evolution from biases due to parsimony (i.e., node-density effects).