MolluscaBase taxon details
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Taxonomic remark The view of Marquet, 2005 is here followed. In contrast, Moerdijk et al., 2010 considers both subspecies as belonging to one species (chamaeformis), with orbicularis as a possible form. However, Jansen & van der Slik (1972) acted as First Revisors, so orbicularis should have been the valid name in case both are considered the same species. But the given differences in morphology and geological occurence between both, it seems better to regard them as geochronological subspecies, following in this Marquet, 2005. [details]
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