Researchers in Japan have identified different cockroach species based on egg casing impressions in Jomon-era pottery. Using the information, they found that the two main species in modern Japan had already been divided, east–west, at that time more than 5,000 years ago. Their work was published in the Journal of Archaeological Science: Reports on Aug. 30, 2022.
Click here for original story, Japanese cockroach east-west separation established more than 5,000 years ago
Source: Phys.org