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Hystrichosphaeridium danicum
Hystrichosphaeridium danicum (W. Wetzel, 1952) W. Wetzel, 1955
Now Achomosphaera. Originally Areoligera, subsequently Baltisphaeridium, thirdly Hystrichosphaeridium, fourthly Cleistosphaeridium, fifthly (and now) Achomosphaera.
Tax. jr. synonym of Areoligera senonensis Lejeune-Carpentier, 1938, according to Lejeune-Carpentier and Sarjeant, 1981. Sarjeant, 1984, retained Hystrichosphaeridium (as Achomosphaera) danicum as a separate species.
Holotype: W. Wetzel, 1952, pl.A, fig.6
Age: Paleocene
OriginaI diagnosis: W. Wetzel, 1952, p. 396: Areoligera danica
A species of the genus Areoligera with high-arched capsule and distinctive, separately formed processes.
Emended diagnosis: Sarjeant, 1984, p. 129
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).
Now Achomosphaera. Originally Areoligera, subsequently Baltisphaeridium, thirdly Hystrichosphaeridium, fourthly Cleistosphaeridium, fifthly (and now) Achomosphaera.
Tax. jr. synonym of Areoligera senonensis Lejeune-Carpentier, 1938, according to Lejeune-Carpentier and Sarjeant, 1981. Sarjeant, 1984, retained Hystrichosphaeridium (as Achomosphaera) danicum as a separate species.
Holotype: W. Wetzel, 1952, pl.A, fig.6
Age: Paleocene
OriginaI diagnosis: W. Wetzel, 1952, p. 396: Areoligera danica
A species of the genus Areoligera with high-arched capsule and distinctive, separately formed processes.
Emended diagnosis: Sarjeant, 1984, p. 129
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).