Mark, hynobiids can be divided into "lotic-breeding" hynobiids like Hynobius kimurae, H.naevius, H.stejnegeri and Onychodactylus japonicus that use streams, and "lentic-breeding" hynobiids like H.tokyoensis, H.neblosus, H.nigrescens, H.lichenatus, H. dunni, H. retardatus and H.takedai that use still water.
As for elevations, in the area around where I live, H.tokyoensis inhabit the lowlands, while H.kimurae can be found during the breeding season in small, rocky streams at elevations over 400 meters, and O.japonicus in streams at even higher elevations (with some overlap with H.kimurae).
(Message edited by TJ on April 11, 2004)