CINCINNATI -- He was known as The Cobra. Dave Parker was an intimidating force when he wielded that 37-ounce bat during the 1970s and '80s for six Major League teams, including the Pirates and Reds.
The taxon of aquatic animals is a taxon. A clade is a monophyletic taxon or monophyletic group if you prefer. A monophyletic taxon (or a clade) is defined as a taxon that contains only all descendants of a common ancestor and the common ancestor.
The evolutionary history of a taxon is called its phylogeny. To establish phylogenies, decisions must be made concerning which characteristics are âprimitiveâ and which âadvancedââthat is, which taxon is the ancestor of the others.