MolluscaBase taxon details
original description
(of Helcion problematicus Nagao & Otatume, 1938 †) 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]
basis of record
Beu, A. G. (2007). The “inoceramus limpet”Gigantocapulus problematicus (Nagao & Otatume, 1938) in New Zealand (Late Cretaceous Gastropoda or Monoplacophora, Gigantocapulidae n. fam.). <em>Paläontologische Zeitschrift.</em> 81(3): 267-282., available online at https://doi.org/10.1007/bf02990177 [details]