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Cleistosphaeridium placacanthum
Cleistosphaeridium placacanthum, (Deflandre and Cookson, 1955, p.276-277, pl.9, figs.1-3), Eaton et al., 2001, p.190; Emendation: May, 1980, p.68, as Systematophora placacantha.
Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Impletosphaeridium, fourthly Systematophora, fifthly (and now) Cleistosphaeridium.
Taxonomic junior synonyms: Baltisphaeridium (now Impletosphaeridium) panniforme, according to Sarjeant (1984b, p.86-87) - however, Eaton et al. (2001, p.191) retained Baltisphaeridium (as and now Impletosphaeridium) panniforme; Systematophora ancyrea, according to Stover and Evitt (1978, p.84) - however, Lentin and Williams (1981, p.272) retained Systematophora ancyrea.
Holotype: Deflandre and Cookson, 1955, pl.9, figs.1-2; Fauconnier and Masure, 2004, pl.76, figs.14-16.
Age: Miocene.
Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Impletosphaeridium, fourthly Systematophora, fifthly (and now) Cleistosphaeridium.
Taxonomic junior synonyms: Baltisphaeridium (now Impletosphaeridium) panniforme, according to Sarjeant (1984b, p.86-87) - however, Eaton et al. (2001, p.191) retained Baltisphaeridium (as and now Impletosphaeridium) panniforme; Systematophora ancyrea, according to Stover and Evitt (1978, p.84) - however, Lentin and Williams (1981, p.272) retained Systematophora ancyrea.
Holotype: Deflandre and Cookson, 1955, pl.9, figs.1-2; Fauconnier and Masure, 2004, pl.76, figs.14-16.
Age: Miocene.