Williams, Lentin and Fensome 1998 - Lentin and Williams Index of Fossil Dinoflagellates

Achomosphaera danica, (W. Wetzel, 1952, p. 396-397, pl.A, figs.5–6; text-fig.8); Emendation: Sarjeant, 1984c, p. 129-130

Originally Areoligera, subsequently Baltisphaeridium, thirdly Hystrichosphaeridium, fourthly Cleistosphaeridium?, fifthly (and now) Achomosphaera.
Tax. sr. syn.: Areoligera senonensis, according to Lejeune-Carpentier and Sarjeant (1981, p.15) - however, Sarjeant (1984c, p.129) retained Achomosphaera danica.

Holotype: W. Wetzel, 1952, pl.A, fig.6.
Locus typicus: Kiel district, Germany
Stratum typicum: Paleocene (Danian flint from the German drift - Jungdiluvium)
Age: Paleocene

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Original description as Areoligera danica : [W. Wetzel, 1952, p. 396] (Translation: Sarjeant, 1984):

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).