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

Abratopdinium kerguelense, Mao Shaozhi and Mohr, 1992, p.318, pl.1, figs.1-2,6:

Holotype: Mao Shaozhi and Mohr, 1992, pl.1, fig.1; Locus typicus: ODP Hole 748c, Banzare Bank, S Indian Ocean
Age: Late Campanian-Early Maastrichtian

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Original description: [Mao Shaozhi and Mohr, 1992]:

Description:
Cyst circumcavate, spherical to subspherical. Both apex and antapex rounded without any horns or projections.
Wall two layered; both periphragm and endophragm are thin and hyaline. Periphragm smooth, some with folds usually parallel to the outline or ornamented with verrucae 1.5-2.5 µm across and 2-3.5 µm apart. The verrucae, where present, delineate the paracingulum. The width of lateral pericoel varies, depending on the relative size of the endocyst, usually about one-third to one-tenth of the total width of the cyst.
Endocyst spherical to subspherical.
Paracingulum usually present, 5-7 µm wide,slightly levorotatory, indicated by two rows of low ridges, some of which are visible only around the cyst margins or rarely indicated by the aligned verrucae.
Parasulcus, where present, is limited to the hypocyst, and widened toward the posterior.
Archeopyle intercalary [2a], standard hexastyle, iso-thetaform, or rounded at each corner; operculum usually free.

Dimensions/Size: Length of cysts, 36.5-51 (holotype 47.6) µm; width of cysts, 39.5-53 (holotype 44) µm; 20 specimens measured.