D. kokuraensis (Uyeno 1979), D. primotinus (Uyeno 1979), and D. altiformis were dominant members of an Early Cretaceous lake fauna (the "Diplomystus-Wakinoichthys Fauna") in what is now Japan and Korea.
D. kokuraensis (Uyeno 1979), D. primotinus (Uyeno 1979), and D. altiformis represented the most common species in an Early Cretaceous lake fauna ("Diplomystus-Wakinoichthys Fauna") that existed in what is now Japan and Korea.