Traits name details
original description
Ulrich, E. O. (1892). New Lower Silurian Lamellibranchiata, chiefly from Minnesota rocks. <em>The Geological and Natural History Survey of Minnesota, Annual report.</em> 19: 211-248., available online at https://hdl.handle.net/11299/56262 page(s): 235, textfig. 21a, b [details] 
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