Tetrachacysta spinosigibberosa
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spinosigibberosa (Brideaux and Fisher, 1976, p.22–24, pl.4, fig.9; pl.5, figs.1–16) Backhouse, 1988, p.110. Holotype: Brideaux and Fisher, 1976, pl.5, figs.1,5–8. Originally Horologinella, subsequently (and now) Tetrachacysta. Age: late Oxfordian–?Portlandian.
Parent: Tetrachacysta