Horologinella biconvexa subsp. laevigata Zheng Yuefang and Liu Xuexian in Liu Zhili et al., 1992, p.69-70, pl.10, figs.1-2.

NOW Tetrachacysta biconvexa subsp. laevigata. Originally Horologinella biconvexa subsp. laevigata, subsequently (and now) Tetrachacysta biconvexa subsp. laevigata.

Holotype: Liu Zhili et al., 1992, pl.10, fig.2.
Age: early Tertiary.