From Fensome et al., 2019:
Stichodinium subtile (He Chengquan and Wang Kede, 1990, p.418,424, pl.2, fig.3; text-fig.2) Williams et al., 2015, p.314. Holotype: He Chengquan and Wang Kede, 1990, pl.2, fig.3; text-fig.2. Originally Wilsonidium, subsequently (and now) Stichodinium. Age: late Early Eocene.

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