MolluscaBase source details
Baker, F. C. (1933). A new form of Polygyra tridentata from Illinois. The Nautilus. 47(2): 58-59.
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Baker, F. C.
1933
A new form of <i>Polygyra tridentata</i> from Illinois.
The Nautilus
47(2): 58-59
Publication
Polygyra tridentata var. frisoni F. C. Baker, 1933 accepted as Triodopsis discoidea (Pilsbry, 1904) (original description)