Traits name details
original description
Ota, Y. (1959). <em>Trigonioides</em> and its classification. <em>Transactions and Proceedings of the Palaeontological Society of Japan, new series.</em> 34: 97-104., available online at https://doi.org/10.14825/prpsj1951.1959.34_97 page(s): 102, pl. 11, figs 12-20 [details] Available for editors 
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