Tetrachacysta allenii
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*allenii Backhouse, 1988, p.110, pl.42, figs.la–b,2a–b,3; text-figs.32A–C. Holotype: Backhouse, 1988, pl.42, figs.la–b; text-figs.32B–C; Fensome et al., 1993a, figs.1–2 — p.905. Taxonomic junior synonym: Horologinella biconvexa subsp. granulata, according to Xu Jinli et al. (1997, p.42) — however, He Chengquan et al., 2009, p.374) retained that taxon. Age: ?Valanginian–early Barremian.
Parent: Tetrachacysta