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Kobayashi, T.; Tamura, M. (1957). Additional new genera and species of trigonians from the Jurassic of Soma, North Japan. Studies on the Jurassic Trigonians in Japan, Part VI. Japanese Journal of Geology and Geography. 28: 35-41.
Kobayashi, T.; Tamura, M. (1957). Additional new genera and species of trigonians from the Jurassic of Soma, North Japan. Studies on the Jurassic Trigonians in Japan, Part VI. Japanese Journal of Geology and Geography. 28: 35-41.
