Traits name details
original description
(of Trigonia japonica Yehara, 1923 †) Yehara, S. (1923). Cretaceous Trigoniae from Amakusa islands, Prov. Higo, Kyûshû, Japan. <em>The Journal of the Geological Society of Japan.</em> 30: 1-12. page(s): 10, pl. 6, figs 6, 7 [details] 
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