MolluscaBase source details
Wurtz, C. B. (1949). Physa heterostropha (Say). The Nautilus. 63(1): 20-33, pl. 2, text-fig. 1.
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Wurtz, C. B.
1949
<i>Physa heterostropha</i> (Say)
The Nautilus
63(1): 20-33, pl. 2, text-fig. 1
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