Classification of the genus Placocoenia
G. †Placocoenia d'Orbigny 1849
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†Placocoenia heimi Koby 1895
†Placocoenia hideshimaensis Eguchi 1951
†Placocoenia macrophthalma Goldfuss 1826
†Placocoenia major Felix 1903
†Placocoenia ohinataensis Eguchi 1951
†Placocoenia robusta Oppenheim 1930
†Placocoenia tanohataensis Eguchi 1951