A subdiscipline that focuses on the diversity and mutability of social formats, in the present and throughout recorded history and in the archeological record and in the biology of social species.
As a counter to evolutionary psychologists (EvolPsychos) who assert that there are direct Darwinian forces shaping human psychology, we need people to assert that there are palpable Kropotkinian forces shaping human societies. Likewise, we must assert that just like how it is impossible to fully understand an allele without the context of the interactions of the environment and the phenotypes associated with that allele, it is impractical to try to understand human psychology in isolation from human societies/cultures.
You want to invent anthropology?
What you got there, mate, is called History.