Visbysphaera Appendix A
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VISBYSPHAERA Lister, 1970, p.98. Emendations: Kiryanov, 1978, p.21; Le Hérissé, 1989, p.198-199. Acritarch genus. For synonymy see Fensome et al. (1990, p.529). Type: Downie, 1963, pl.92, fig.4, as Baltisphaeridium dilatispinosum.