Horologinella 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. Holotype: Liu Zhili et al., 1992, pl.10, fig.2. NOW Tetrachacysta biconvexa subsp. laevigata. Originally Horologinella biconvexa subsp. laevigata, subsequently (and now) Tetrachacysta biconvexa subsp. laevigata. Age: Early Tertiary.
Parent: Horologinella biconvexa