The evolutionary history of the group is described as basal taxon.
A lineage represented by a phylogenetic tree that develops early from the root and from which no other branches diverged.
Phylogenetic tree can be explained as:
In a phylogenetic tree the branch point in the tree (often drawn on the far left) represents the most recent common ancestor of all taxa in the tree. The lineages that distinguish themselves from all other members of the group early in the history of the group are called basal taxa.
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