original description(ofAstriclypeus manni ambigenus Nisiyama, 1935 †)Nisiyama, S. 1935. On Some Fossil Echinoids from Northeastern Japan. Saito Ho-on Kai Museum Research Bulletin 5, 131-172 . page(s): 140-145; figs. 3a-c, pl. 8: figs. 1-3 [details]
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