From Fensome et al., 2019:
Zhongyuandinium turbinatum ssp. pygmeum Zhu Shenzhao, He Chengquan and Jin Guangxing in He Chengquan et al., 1989

Holotype: He Chengquan et al., 1989, pl.8, fig.1; text-fig.15
Age: Early Tertiary