Traits name details
original description
Kobayashi, T.; Mori, K. (1954). Studies on the Jurassic trigonians in Japan. Part. II. Prosogyrotrigonia and the Trigoniinae. <em>Japanese Journal of Geology and Geography.</em> 25: 155-175. page(s): 167, pl. 16, fig. 8a, b [details] Available for editors 
|