Ammonidium Appendix A
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AMMONIDIUM Lister, 1970, p.48-49. Emendations: Le Hérissé, 1989, p.80-81, as a revised diagnosis; Sarjeant and Vavrdova, 1997, p.15. Acritarch genus. Type: Downie, 1963, pl.92, fig.6, as Baltisphaeridium microcladum.
