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.

Species List: