Tetrachacysta 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) He Chengquan et al., 2009, p.374. Holotype: Liu Zhili et al., 1992, pl.10, fig.7. 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: Tetrachacysta biconvexa