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Bivalvia - Trigoniida - Megatrigoniidae
It was reranked as Trigonia (Scabrotrigonia) by Rennie (1945); it was reranked as Pterotrigonia (Scabrotrigonia) by Tashiro and Kozai (1982) and Tashiro (1988).
It was assigned to Trigonia by Rennie (1945); to Trigoniidae by Vokes (1980); to Pterotrigonia by Tashiro and Kozai (1982) and Tashiro (1988); and to Trigonioida by Sepkoski (2002).
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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.