Horologinella biconvexa subsp. granulata
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"subsp. granulata" Zheng Yuefang and Liu Xuexian in Liu Zhili et al., 1992, p.70, pl.10, figs.3–8. Holotype: Liu Zhili et al., 1992, pl.10, fig.7. NOW Tetrachacysta biconvexa subsp. granulata. Originally Horologinella biconvexa subsp. granulata, subsequently (and now) Tetrachacysta biconvexa subsp. granulata. Taxonomic senior synonym: Tetrachacysta allenii, according to Xu Jinli et al. (1997, p.42) — however, He Chengquan et al., 2009, p.374) retained this taxon. Age: Early Tertiary.
Parent: Horologinella biconvexa