(ofMyophorella (Promyophorella) sigmoidalis T. Kobayashi & Tamura, 1955 †)Kobayashi, T.; Tamura, M. (1955). The Myophorellinae from North Japan. Studies on the Jurassic trigonians in Japan. Part IV. <em>Japanese Journal of Geology and Geography.</em> 26: 89-103. page(s): 96, pl. 5, figs 1-3 [details] Available for editors
MolluscaBase eds. (2025). MolluscaBase. Promyophorella sigmoidalis T. Kobayashi & Tamura, 1955 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1332305 on 2025-05-18
Marine Species Traits editorial board (2025). Marine Species Traits. Promyophorella sigmoidalis T. Kobayashi & Tamura, 1955 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1332305 on 2025-05-18
original description(ofMyophorella (Promyophorella) sigmoidalis T. Kobayashi & Tamura, 1955 †)Kobayashi, T.; Tamura, M. (1955). The Myophorellinae from North Japan. Studies on the Jurassic trigonians in Japan. Part IV. <em>Japanese Journal of Geology and Geography.</em> 26: 89-103. page(s): 96, pl. 5, figs 1-3 [details] Available for editors