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Cleistosphaeridium oligacanthum ssp. granulatum
From Fensome et al., 2019:
Cleistosphaeridium oligocanthum ssp. granulatum (Wetzel, 1952, p.404, text-fig.25) Lentin and Williams, 1973, p.29. Emendation: Sarjeant, 1984c, p.136, as Surculosphaeridium? granulatum. Holotype: Wetzel, 1952, text-fig.25; Sarjeant,
1984c, pl.5, figs.1–3; text-fig.8. NOW Surculosphaeridium? granulatum. Originally
Hystrichosphaeridium oligacanthum subsp. granulatum, subsequently Baltisphaeridium oligacanthum
subsp. granulatum (Appendix A), thirdly Cleistosphaeridium? oligacanthum subsp. granulatum, fourthly
(and now) Surculosphaeridium? granulatum. Age: Paleocene.
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Original diagnosis as Hystrichosphaeridium oligocanthum ssp. granulatum: [W. Wetzel, 1952, p. 404]: (Translation: Sarjeant, 1984)
Diagnosis:
Two specimens from flint boulder "Ak" reveal, by their dimensions and the relatively low number of processes, their relationship with H. oligacanthum but exhibit a feature not seen in other members of that species, namely a granulation of the capsule membrane. This granularity might be taken as a mere result of state of preservation were it not that, in related forms, no least suggestion of similar features was observed . . . The figured specimen shows on the upper surface a membrane defect, as is so commonly to be remarked in our plankton.
Cleistosphaeridium oligocanthum ssp. granulatum (Wetzel, 1952, p.404, text-fig.25) Lentin and Williams, 1973, p.29. Emendation: Sarjeant, 1984c, p.136, as Surculosphaeridium? granulatum. Holotype: Wetzel, 1952, text-fig.25; Sarjeant,
1984c, pl.5, figs.1–3; text-fig.8. NOW Surculosphaeridium? granulatum. Originally
Hystrichosphaeridium oligacanthum subsp. granulatum, subsequently Baltisphaeridium oligacanthum
subsp. granulatum (Appendix A), thirdly Cleistosphaeridium? oligacanthum subsp. granulatum, fourthly
(and now) Surculosphaeridium? granulatum. Age: Paleocene.
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Original diagnosis as Hystrichosphaeridium oligocanthum ssp. granulatum: [W. Wetzel, 1952, p. 404]: (Translation: Sarjeant, 1984)
Diagnosis:
Two specimens from flint boulder "Ak" reveal, by their dimensions and the relatively low number of processes, their relationship with H. oligacanthum but exhibit a feature not seen in other members of that species, namely a granulation of the capsule membrane. This granularity might be taken as a mere result of state of preservation were it not that, in related forms, no least suggestion of similar features was observed . . . The figured specimen shows on the upper surface a membrane defect, as is so commonly to be remarked in our plankton.