A trio of researchers with the Forestry and Forest Products Research Institute and Shizuoka University, both in Japan, has confirmed the eight-year periodicity of the train millipede. In their paper published in the journal Royal Society Open Science, Keiko Niijima, Momoka Nii and Jin Yoshimura describe their multi-year study of the myriapod invertebrate Parafontaria laminata armigera Verhoeff, which is endemic to Japan, and what they learned about it.