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Gastropoda - Discohelicidae
It was reranked as Nummocalcar (Platybasis) by Fischer and Weber (1997); it was misspelled as Platybassis by Sepkoski (2002).
It was assigned to Euomphalidae by Knight et al. (1960); to Discohelicidae by Schröder (1995); to Nummocalcar by Fischer and Weber (1997); and to Archaeogastropoda by Sepkoski (2002).
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.