Abstract
Evittosphaerula paratabulata Manum, 1979, emended herein, and Chaenosphaerula magnifica Damassa, gen. et sp. nov., described herein, are fossil dinoflagellates whose preservable cysts are represented solely by a parasutural framework without intervening wall material. Variations of plate configurations used to define these genera and species illustrate the principle of ‘variable variables’ (Evitt, 1985), and emphasize the need for a continual reassessment of the details of tabulation as expressed by paraplate quartet interactions in dinoflagellate classification. In contrast to previous reports, occurrences of these species at Deep Sea Drilling Project Hole 338 indicate that the stratigraphic range of E. paratabulata is actually restricted to the Early Miocene, while Chaenosphaerula magnifica occurs only in the Late Oligocene, making differentiation of these two species of critical importance to the recognition of the Oligocene/Miocene boundary in Norwegian Sea sedimentary sequences.
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