Distinguishing features:
Parent taxon (Tangential wall): Wall formed of crystals with tangential c-axes (Thoracosphara s.l.)
This taxon: Spherical, with circular archaeopyle, no paratabulation. Wall structure irregular with tangential c-axes.
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| | | | Cervisiella operculata |
| Cervisiella saxea | |||
| | | Cervisiella sp. | |
Taxonomy:
Catalog entries: Cervisiella
Distinguishing features:
Parent taxon (Tangential wall): Wall formed of crystals with tangential c-axes (Thoracosphara s.l.)
This taxon: Spherical, with circular archaeopyle, no paratabulation. Wall structure irregular with tangential c-axes.
Original description: Spherical calcareous dinoflagellate cysts with circular archaeopyles, not showing paratabulation. The outer calcareous wall consists of irregularly shaped and arranged crystallites. Under the light microscope in crossed nicols and with gypsum plate, thin sections exhibit clear interference colours and have a positive optic sign, thus indicating tangentially oriented c-axes.
Geological Range:
Last occurrence (top): within Serravallian Stage (11.62-13.82Ma, top in Serravallian stage). Data source: Total of range of species in this database
First occurrence (base): within Maastrichtian Stage (66.04-72.05Ma, base in Maastrichtian stage). Data source: Total of range of species in this database
Hildebrand-Habel, T., Willems, H. & Versteegh, G. J. M. (1999). Variations in calcareous dinoflagellate associations from the Maastrichtian to Middle Eocene of the western South Atlantic Ocean (São Paulo Plateau, DSDP Leg 39, Site 356). Review of Palaeobotany and Palynology. 106: 57-87. gsReferences:
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Cervisiella compiled by Jeremy R. Young viewed: 24-1-2022
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20069 Go to Archive.is to create a permanent copy of this page - citation notes |
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