Traits name details
original description
(of Unio umbonatus Eichwald, 1861 †) Eichwald, E. (1861). Lethaea rossica, ou, Paléontologie de la Russie. Premier volume. Ancienne période. Schweizerbart, Stuttgart, 1657 pp. + atlas., available online at https://www.biodiversitylibrary.org/bibliography/52391#/summary page(s): 1002-1003, pl. 39, fig. 21a, b [details]
basis of record
Gusev, A. K. (1990). Nemorskiye dvustvorchatyye mollyuski verkhney permi Yevropeyskoy chasti SSSR [Upper Permian non-marine bivalves of the European part of the USSR]. Izdatel'stvo Kazanskogo universiteta, Kazan, 295 pp. page(s): 73-75, pl. 1, figs 12-14 [details] Available for editors
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