Yehara, S. (1915). The Cretaceous Trigoniae from Miyako and Hokkaido. <em>The Science Reports of the Tōhoku University, Series 2, Geology.</em> 2: 35-44. page(s): 41, pl. 2, figs 15-17 [details]
original descriptionYehara, S. (1915). The Cretaceous Trigoniae from Miyako and Hokkaido. <em>The Science Reports of the Tōhoku University, Series 2, Geology.</em> 2: 35-44. page(s): 41, pl. 2, figs 15-17 [details]
Present Inaccurate Introduced: alien Containing type locality