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Cleistosphaeridium danicum
From Fensome et al., 2019:
Cleistosphaeridium danicum (Wetzel, 1952, p.396–397, pl.A, figs.5–6; text-fig.8) Davey et al., 1969, p.15. Emendation: Sarjeant, 1984c, p.129–130, as Achomosphaera danica. Holotype: Wetzel, 1952, pl.A, fig.6; Dietz et al., 1999, text-fig.6b. NOW Achomosphaera. Originally Areoligera, subsequently Baltisphaeridium (Appendix A), thirdly Hystrichosphaeridium, fourthly Cleistosphaeridium?, fifthly (and now) Achomosphaera. Questionable assignment: Davey et al. (1969, p.15). Taxonomic senior synonym: Areoligera senonensis, according to Lejeune-Carpentier and Sarjeant (1981, p.15) — however, Sarjeant (1984c, p.130) retained Cleistosphaeridium (as Achomosphaera) danicum. This combination was not validly published in Davey et al. (1966, p.170), since those authors did not fully reference the basionym. Age: Paleocene.
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Original diagnosis as Areoligera danica: [W. Wetzel, 1952, p. 396]:
Diagnosis:
A species of the genus Areoligera with high-arched capsule and distinctive, separately formed processes.
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Emended diagnosis:
Sarjeant, 1984, p. 129:
Diagnosis:
Cyst proximochorate, spiniferate, hercotabulate. Ambitus broadly ovoidal to rounded-subpolygonal.
Processes gonal and intergonal in situation, relatively short and stubby (in length c. one-fifth of the cyst breadth), bifid to trifid, with brief branches of equal, or almost equal, length and undivided.
Phragma of moderate thickness, its surface apparently granular.
Archaeopyle single plate precingular (Type P).
Cleistosphaeridium danicum (Wetzel, 1952, p.396–397, pl.A, figs.5–6; text-fig.8) Davey et al., 1969, p.15. Emendation: Sarjeant, 1984c, p.129–130, as Achomosphaera danica. Holotype: Wetzel, 1952, pl.A, fig.6; Dietz et al., 1999, text-fig.6b. NOW Achomosphaera. Originally Areoligera, subsequently Baltisphaeridium (Appendix A), thirdly Hystrichosphaeridium, fourthly Cleistosphaeridium?, fifthly (and now) Achomosphaera. Questionable assignment: Davey et al. (1969, p.15). Taxonomic senior synonym: Areoligera senonensis, according to Lejeune-Carpentier and Sarjeant (1981, p.15) — however, Sarjeant (1984c, p.130) retained Cleistosphaeridium (as Achomosphaera) danicum. This combination was not validly published in Davey et al. (1966, p.170), since those authors did not fully reference the basionym. Age: Paleocene.
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Original diagnosis as Areoligera danica: [W. Wetzel, 1952, p. 396]:
Diagnosis:
A species of the genus Areoligera with high-arched capsule and distinctive, separately formed processes.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended diagnosis:
Sarjeant, 1984, p. 129:
Diagnosis:
Cyst proximochorate, spiniferate, hercotabulate. Ambitus broadly ovoidal to rounded-subpolygonal.
Processes gonal and intergonal in situation, relatively short and stubby (in length c. one-fifth of the cyst breadth), bifid to trifid, with brief branches of equal, or almost equal, length and undivided.
Phragma of moderate thickness, its surface apparently granular.
Archaeopyle single plate precingular (Type P).