Tetrachacysta biconvexa subsp. laevigata
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subsp. laevigata (Zheng Yuefang and Liu Xuexian in Liu Zhili et al., 1992, p.69–70, pl.10, figs.1–2) He Chengquan et al., 2009, p.374. Holotype: Liu Zhili et al., 1992, pl.10, fig.2. Originally Horologinella biconvexa subsp. laevigata, subsequently (and now) Tetrachacysta biconvexa subsp. laevigata. Age: Early Tertiary.
Parent: Tetrachacysta biconvexa