basis of recordMaderni U.N. (1990). Mollusks of the continental Cenozoic of the Turgai Depression and adjacent areas [= Моллюски континентального кайнозоя Тургайского прогиба и смежных регионов]. <em>Trudy VSEGEI.</em> 345: 1-191. [In Russian]., available online athttp://ashipunov.me/shipunov/school/books/moll_kontin_kajnoz_turgajskogo_progiba_1990.djvu page(s): 54-56, pl. 15, figs 5-8 [details]
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