†Mercimonia Dall 1902 (venus clam)
Bivalvia - Cardiida - Veneridae
Parent taxon: Tapetinae according to H. E. Vokes 1980
Sister taxa: Cyclorisma, Cyclorismina, Eumarcia, Flaventia, Gomphina, Granicorium, Irus, Katelysia, Legumen, Liocyma, Marcia, Paphia, Paraesa, Retrotapes, Ruditapes, Sinonia, Tapes, Textivenus, Venerella, Veneritapes
Subtaxa: Mercimonia mercenaroides
Ecology: facultatively mobile infaunal suspension feeder