Traits taxon details
original description
(of ) Meek, F.B. (1870). Descriptions of fossils collected by the U. S. Geological Survey under the charge of Clerence King, Esq. <em>Proceedings of the Academy of Natural Sciences of Philadelphia</em>. 22: 56-64, available online at https://www.biodiversitylibrary.org/page/26300427 page(s): 60 [details]
basis of record
Firby, J.R. (1993). A new species of <em>Vorticifex</em> (Gastropoda: Planorbidae) from late Cenozoic lake deposits, Nevada <em>Journal of Paleontology</em>. 67(3): 370-374, available online at https://doi.org/10.1017/S0022336000036854 page(s): 373 [details]
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