This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
Corresponding author (Name, Year)
Ref.: T. Nagao. 1928. Palaeogene fossils of the Island of Kyushu, Japan Part II. Science Reports of the Tohoku Imperial University 12(1):11-140