Yin (1974, p. 25) introduced a new genus, Quadratia, for a group of Middle Triassic bivalves in the family Myophoriidae. The type species designated by him is Quadratia quadrataYin, 1974 [p. 25, pl. 1, figs. 3 (syntype, holotype in original text, right valve), 4a–c (syntype, holotype in original text, left valve), 5 (syntype, paratype in original text); text-fig. 3], the type stratum and locality of which are the Qingyan Formation at Qingyan of Guiyang, Guizhou Province, Southwest China (see also Fang et al., 2009, p. 56, Figs. 16.18–16.21). But this genus name has been preoccupied by...

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