Canningia minor var. psilata, Burger, 1980

Now Kallosphaeridium? helbyi subsp. psilatum. Originally Canningia? minor var. psilata, subsequently Canningia? minor subsp. psilata, thirdly Chytroeisphaeridia minor subsp. psilata, fourthly (and now) Kallosphaeridium? helbyi subsp. psilatum.

Holotype: Burger, 1980, pl.25, fig.10
Distribution: rare to uncommon species in Surat Basin.
Age: Late Albian-Early Cenomanian

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Original description: [Burger, 1980]:

Description:
Cyst spherical to egg-shaped, without apical or antapical horns.
Archaeopyle apical with a circular outline, margin notched, outlining the presence of 6 precingular paraplates.
No other traces of paratabulation are visible.
Cyst wall single-layered, psilate, 0.5-1.5 µm thick.

Dimensions:
Apical diameter (26 dehisced specimens) 32-(50)-65 µm, width (34 specimens) 26-(46)-84 µm.

Remarks:
The specimens from the Surat Basin are consistently psilate, in which respect they vary from Canningia minor itself.