WoRMS source details
Okutani, T., Kojima, S. & Ashi, J., 1996. An unusual vesicomyid bivalve, Calyptogena nankaiensis n. sp. from bathyal depth off Honshu, Japan. Venus, 55 (4): 257-263.
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Calyptogena nankaiensis Okutani, Kojima & Ashi, 1996 accepted as Phreagena nankaiensis (Okutani, Kojima & Ashi, 1996) (original description)