Hasebe (1948) established Nipponanthropus akashiensis based on an innominate recovered from Nishiyagi, northern Japan.
Campbell (1965) misspelled the species epithet as 'akasiensis'. This misspelling is repeated in Groves (1989). Campbell (1965) and Groves (1989) both list the taxon as available and valid.
Tamburello (1957) provides a brief history of fossils from Japan including this taxon. Watanabe (1970) provides a review of the find.