original description
(of Helisoma (Pierosoma) trivolvis kolymense Lindholm, 1932 †) Lindholm W.A. (1932). On the finding of the American species Helisoma trivolvis Say (Gastropoda, Planobidae) in the Pleistocene deposits of the Kolyma River [= О нахождении американского Helisoma trivolvis Say (Gastropoda, Planorbidae) в плейстоцене р. Колымы]. <em>Trudy Komissii po izucheniyu proizvoditel'nykh sil AN SSSR. Seriya yakutskaya.</em> 11: 65–73. [In Russian].
page(s): 69, figs 1-4 [details] Available for editors
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New combination Combination established herein, for consistency with parent species classification. [details]