Crown Group - Other Groups Under The Crown Group Concept

Other Groups Under The Crown Group Concept

The cladistic idea of strictly using the topography of the phylogenetic tree to define groups, necessitates other definitions than crown groups to adequately define commonly discussed fossil groups like dinosaurs and various Burgess Shale fauna. Thus, a host of prefixes have been defined to describe various branches of the phylogenetic tree relative to extant organisms.

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