Tetrachacysta biconvexa
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biconvexa (Jiabo, 1978, p.95, pl.29, figs.20–21) He Chengquan et al., 2009, p.374. Holotype: Jiabo, 1978, pl.29, fig.21. Originally Horologinella, subsequently (and now) Tetrachacysta. Age: Early Tertiary.
Parent: Tetrachacysta
Infrataxon List: