Tetrachacysta spinosigibberosa

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