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Bivalvia - Protobranchia
It was reranked as Nuculana (Ryderia) by Melville (1956).
It was assigned to Nuculana by Melville (1956); to Nuculanidae by Vokes (1980); to Nuculoida by Sepkoski (2002); to Polidevciinae by Yin and McRoberts (2006); and to Polidevciidae by Ros-Franch et al. (2014).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.