MolluscaBase name details
Helcion problematicus Nagao & Otatume, 1938 †
1732481 (urn:lsid:marinespecies.org:taxname:1732481)
unaccepted (superseded combination)
Species
marine, brackish, fresh, terrestrial
fossil only
Nagao, T. & Otatume, K. (1938). Molluscan fossils of the Hakobuti Sandstone of Hokkaido. <em>Journal of the Faculty of Science, Hokaido Imperial University, Series 4, Geology and Minerology.</em> 4: 31-56. [details]
MolluscaBase eds. (2025). MolluscaBase. Helcion problematicus Nagao & Otatume, 1938 †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1732481 on 2025-09-12
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original description
Nagao, T. & Otatume, K. (1938). Molluscan fossils of the Hakobuti Sandstone of Hokkaido. <em>Journal of the Faculty of Science, Hokaido Imperial University, Series 4, Geology and Minerology.</em> 4: 31-56. [details]
