Where is the German cockroach species believed to have geographically originated?

Answer

Asia, perhaps around India or Sri Lanka

The German cockroach (*Blattella germanica*) is a globally successful species whose story is relatively recent in evolutionary terms, believed to have originated in Asia, possibly in the vicinity of India or Sri Lanka.

Where is the German cockroach species believed to have geographically originated?
animalinsectevolutioncockroachancestor