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Baltisphaeridium placacanthum
Baltisphaeridium placacanthum, (Deflandre and Cookson, 1955), Downie and Sarjeant, 1965
Now Systematophora. Originally Hystrichosphaeridium, subsequently Baltisphaeridium? thirdly Impletosphaeridium, fourthly (and now) Systematophora. Tax. sr. synonym of Cleistosphaeridium panniforme (Gerlach, 1961) Stover and Evitt, 1978, according to Sarjeant, 1984.
Tax. sr. synonym of Systematophora ancyrea Cookson and Eisenack, 1965, according to Stover and Evitt, 1978 however, Lentin and Williams, 1981 retained Systematophora ancyrea as a separate species.
Holotype: Deflandre and Cookson, 1955, pl.9, figs.1-2
Age: Miocene
Now Systematophora. Originally Hystrichosphaeridium, subsequently Baltisphaeridium? thirdly Impletosphaeridium, fourthly (and now) Systematophora. Tax. sr. synonym of Cleistosphaeridium panniforme (Gerlach, 1961) Stover and Evitt, 1978, according to Sarjeant, 1984.
Tax. sr. synonym of Systematophora ancyrea Cookson and Eisenack, 1965, according to Stover and Evitt, 1978 however, Lentin and Williams, 1981 retained Systematophora ancyrea as a separate species.
Holotype: Deflandre and Cookson, 1955, pl.9, figs.1-2
Age: Miocene