Traits taxon details
original description
(of Lymnaea vetusta ambigua Pierce, 1993 †) Pierce, H.G. (1993). The nonmarine mollusks of the Late Oligocene-Early Miocene Cabbage Patch fauna of western Montana III. Aquatic mollusks and conclusions. <em>Journal of Paleontology.</em> 67(6): 980-993. page(s): 985-986, figs 1.16-1.20 [details] Available for editors 
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