(ofVertigo rugosula var. ovulum Sterki, 1890)Sterki, V. (1890). On new forms of <i>Vertigo</i>. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 42: 31-35. page(s): 35 [details]
original description(ofVertigo rugosula var. ovulum Sterki, 1890)Sterki, V. (1890). On new forms of <i>Vertigo</i>. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 42: 31-35. page(s): 35 [details]