Tetrachacysta amphidoxosum (Jiabo, 1978, p.93, pl.6, fig.2) He Chengquan et al., 2009, p.373.

NOW Tetrachacysta. Originally Dinogymnium?, subsequently Microdinium, thirdly (and now) Tetrachacysta.

Holotype: Jiabo, 1978, pl.6, fig.2.
Age: Early Tertiary.