tetrachotomy

tetrachotomy

(ˌtɛtrəˈkɒtəmɪ)
n
the segmentation of something into four parts
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References in periodicals archive ?
The eutherians include representatives of five orders that are presumed to have separated near the basal radiation of eutherians [ILLUSTRATION FOR FIGURE 2 OMITTED], with four of the orders representing an unresolved tetrachotomy: the Artiodactyla, Carnivora, Scandentia, and Rodentia (Novacek and Wyss 1986 and references therein; Novacek 1990).