Oyama and Mizuno (1958, p. 601) proposed a new name Venericardia (Cyclocardia) yokoyamai for Venericardia compressa Yokoyama (1890, p. 196, pl. 25, figs. 4a–b) from the Poronai Formation of the Ishikari coal field, central Hokkaido, northern Japan, because the latter species name was preoccupied by Cardita compressa Reeve (1843, pl. 9, fig. 46). Honda (1989, p. 65) later on proposed Cyclocardia poronaiensis as a new name for V. yokoyamai, which was preoccupied by Cardita yokoyamai Slodkewitsch (1936, p. 45) from the Pliocene? of Sakhalin, Russia. More recently, Kafanov et al. (1999, p. 1) established a new name Cyclocardia oyamai for Venericardia (Cyclocardia) yokoyamai Oyama and Mizuno (non Cardita yokoyamai Slodkewitsch). Their new name is invalid, because Honda (1989) had previously proposed the new name C. poronaiensis for V. yokoyamai.
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