At the time of examination, two males with nuptial coloration (purple-blue) and one female of C. pyrrhogaster were also found in the water. One spent female and one gravid female of the salamander Hynobius hidamontanus were captured from the water, but any egg sac could not be found. This gravid female was estimated to be still in a preovulatory condition because three days later (on 5 May) the adhesive tips of a pair of egg sacs were extruded from her cloacal opening in captivity.

Accompanied Research Collaborators (alphabetical order): Masaichi Kakegawa (Tokyo Metropolitan Komatsugawa Senior High School) and Fujio Kishi (Shirouma Association of Naturalists).