Back
Cleistosphaeridium oligacanthum ssp. granulatum
Cleistosphaeridium oligocanthum ssp. granulatum, (W. Wetzel, 1952), Lentin and Williams, 1973
Now Surculosphaeridium? granulatum. Originally Hystrichosphaeridium oligacanthum ssp. granulatum, subsequently Baltisphaeridium oligacanthum ssp. granulatum, thirdly Cleistosphaeridium? oligacanthum ssp. granulatum, fourthly (and now) Surculosphaeridium? granulatum.
Holotype: W. Wetzel, 1952, text-fig.25; Sarjeant, 1984, pl.5, figs.1-3; text-fig.8
Locus typicus: Kiel district, Germany
Stratum typicum: Paleocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.
Now Surculosphaeridium? granulatum. Originally Hystrichosphaeridium oligacanthum ssp. granulatum, subsequently Baltisphaeridium oligacanthum ssp. granulatum, thirdly Cleistosphaeridium? oligacanthum ssp. granulatum, fourthly (and now) Surculosphaeridium? granulatum.
Holotype: W. Wetzel, 1952, text-fig.25; Sarjeant, 1984, pl.5, figs.1-3; text-fig.8
Locus typicus: Kiel district, Germany
Stratum typicum: Paleocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.