The database deals with radiolarian type specimens which were described from Japan and by Japanese researchers. Each datum is systematically arranged as follows: (1) Scientific name (Generic and specific name), Author name and year, (2)Name of publication, (3)Category of type specimen and registration number, (4)Sample and locality, (5)Name of Geologic bodies and (6)Geologic age.

The original data of this database were collected by YAO and KUWAHARA in order to publish the database of Japanese fossil type specimens described during the 20th Century (2001) edited by IKEYA, HIRANO and OGASAWARA which was published by Palaeontological Society of Japan as Special Papers Number 39. The radiolarian original data were listed at pages 17-90 of the Special Paper No. 39.

The permission for opening of Web site of this database was given by Palaeontological Society of Japan at June, 2002. New data after the Special Paper No. 39 (2001) are added to the original data whenever the new type specimen is described.