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The Complex Chorate Dinoflagellate Cysts of the Bathonian to Oxfordian (Jurassic): Their Taxonomy and Stratigraphic Significance

R. P. W. Stancliffe and W. A. S. Sarjeant
Micropaleontology
Vol. 36, No. 3 (1990), pp. 197-228
DOI: 10.2307/1485506
Stable URL: http://www.jstor.org/stable/1485506
Page Count: 32
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Complex Chorate Dinoflagellate Cysts of the Bathonian to Oxfordian (Jurassic): Their Taxonomy and Stratigraphic Significance
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Abstract

The study of chorate dinoflagellate cysts with complex processes is made difficult by their tendency to be damaged or partially obscured by adherent debris. This has resulted in the group being relatively neglected by comparison with the simpler proximate and cavate cysts. To analyse the morphological variation of complex chorate cysts and produce listings of species characteristics, it proved necessary to return to the original descriptions of assigned species and, whenever possible, to re-examine type material. As a consequence of these morphological reassessments, emendations are made to the genera Compositosphaeridium Dodekova, Hystrichosphaerina Alberti, Systematophora Klement and Polystephanephorus Sarjeant and the species P. calathus (Sarjeant), P. paracalathus (Sarjeant), Hapsidaulax margarethae Sarjeant, Adnatosphaeridium caulleryi (Deflandre) and Surculosphaeridium cribrotubiferum Sarjeant. The new combinations Adnatosphaeridium densifilosum (Cookson and Eisenack), Adnatosphaeridium? speciosum (Alberti) and Hystrichosphaerina? varispinosa (Brenner) are proposed and the combination Surculosphaeridium? vestitum is retained. The re-evaluation of the group highlights the utility of complex chorate dinoflagellate cysts for biostratigraphic research and allows the postulation of several lineages that might form the basis of the group's continued evolution in the Late Jurassic and Cretaceous.

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