The Ultrastructure of Some Circumpolles

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Abstract
One form of Circumpolles described originates in the Airel quarry (France), which also yielded Classopollis harrisii Muir van Konijnenburg-van Cittert. Another form was sampled in the Turonian of Saint-Cirq (France) and corresponds to Classoidites glandis Amerom. The other three forms come from a sample of Triassic at Les Vans (France) in which the genera Circulina and Classopollis are found together. The exine structure of the first form is consistent with that of Classopollis torosus. The exine of Classoidites glandis contains two superimposable columellar levels, such as that of Classopollis, while the exine of Circulina shows only one granular level resting on the endexine of that which is called ectonexine. Thus a transition between this structure and that of Classopollis appears to exist.

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