Traits taxon details
original description
Weaver, C.E. 1916. Tertiary faunal horizons of western Washington. University of Washington Publications in Geology 1(1):1–67., available online at https://www.biodiversitylibrary.org/page/19832863 page(s): 56, pl. 5, fig. 68 [details]
basis of record
Effinger, W. L. (1938). The Gries Ranch fauna (Oligocene) of western Washington. <em>Journal of Paleontology.</em> 12(3): 355-390, pls. 45-47. [details] Available for editors 
additional source
Nesbitt, E.A. (1995). Paleoecological analysis of molluscan assemblages from the middle Eocene Cowlitz Formation, southwestern Washington. <em>Journal of Paleontology.</em> 69(6): 1060-1073., available online at https://doi.org/10.1017/S002233600003804X [details] Available for editors 
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