Periplaneta japanna

Periplaneta japanna is a subtropical field-dwelling cockroach endemic to southern Japan. The Japanese common name means urushi cockroach, or lacquer tree cockroach.

Coloration and living spaces

Nymphs and adults are a dark black, and typically live under stones and pieces of wood. Their ability to bore or live in rotting wood enables their spread via ocean currents.

Distribution

The species is found on several Japanese islands, distributed continuously from Japan's southwestern Ryukyu Islands chain to the south of Kyushu Island, and on Hachijō-jima Island.

Divergent evolution in nymph specimens

Nymph specimens from Hachijō-jima Island and Naha, Okinawa responded to photoperiodic stimuli quite differently during laboratory-induced diapause tests. This “might be regarded as the result of divergent evolution” between the parapatric populations.