basis of recordWalker, B. (1915). Apical characters in <i>Somatogyrus</i>, with description of three new species. <em>The Nautilus.</em> 29(4): 37-41; 29(5): 49-53, text-figures 1-4., available online athttps://www.biodiversitylibrary.org/page/1815863 page(s): 40 [details]