MolluscaBase source details
Sterki, V. (1909). Descriptions of two new American Pupidae. The Nautilus. 22(10): 107-111, pl. 8.
349963
Sterki, V.
1909
Descriptions of two new American Pupidae.
The Nautilus
22(10): 107-111, pl. 8
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Bifidaria clappi Sterki, 1909 accepted as Gastrocopta clappi (Sterki, 1909) (original description)
Vertigo nylanderi Sterki, 1909 (original description)
Vertigo nylanderi Sterki, 1909 (original description)