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Taxonomy
Mercimonia was named by Dall (1902) [Sepkoski's age data: T Eo T Mi]. It is not extant.
It was reranked as Marcia (Mercimonia) by Durham (1944), Squires (1984).
It was assigned to Tapetinae by Vokes (1980); to Marcia by Durham (1944), Squires (1984); and to Veneroida by Sepkoski (2002).
It was reranked as Marcia (Mercimonia) by Durham (1944), Squires (1984).
It was assigned to Tapetinae by Vokes (1980); to Marcia by Durham (1944), Squires (1984); and to Veneroida by Sepkoski (2002).