Systematics, which encompasses taxonomy, is defined by Judd et al. as the study of biological diversity that exists on Earth and its evolutionary history. It involves the theory and practice of grouping individuals into common groups and thereby creating classifications of organisms.
Taxonomy refers to the assignment of scientific names to groups of organisms.
Reconstruct the history of the separation of lineages and of their modifications. Hence, hypotheses are put forward to address the existence of these lineages. Monophyletic group refers to a group that is made up of an ancestor and all its descendants. Paraphyletic group refer to a group that is made up of an ancestor and some but not all of its descendants.