Monophyletic taxonomic groups includes amphibia, hagfishes and ray - finned fishes.
A group consisting of a collection of organisms including the most recent common ancestor of all those organisms and all the descendants. It is identified by the presence of shared and unique characters . Every phylogenetic tree has as many monophyletic groups as there are ancestors.
Example of a monophyletic group is one that is comprised of humans, apes, and new world monkeys because they share the most common recent ancestral group which is old-world monkeys.
Amphibia, ray-finned fish and hagfishes are monophyletic group whereas sharks are not monophyletic.
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