Archetypes

Classification of Monstazoa is split into twelve groups, all representing a different kingdom of creatures.

Once, a very long time ago, the lines between evolutionary families were clear. But the great wounding of the world has caused these lines to blur and form new, fantastic, and unprecedented ecological configurations over millions of years. The separation between these kingdoms is determined not by ancestry, but by collections of traits associated with the general idea of each type of animal-- the originals of which have been lost to time-- hence, the "Archetype" was coined. 

Two species that are of the same Archetype may not be closely related at all, while two species of different Archetypes may be close cousins. Species may also display more than one Archetype if it is unable to be cleanly categorized into a single group.