Wits Evolutionary Studies Institute (ESI)
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Item The evolution of certain upper Cretaceous hystrichospheres from South Africa(Bernard Price Institute for Palaeontological Research, 1969) Davey, Roger J.This paper traces clearly, for the first time, an evolutionary sequence in dinoflagellate cysts. The sedimentary samples containing the cysts are from nnorthern Natal, South Africa, and are of Upper Cretaceous age. The genera concerned in this study are Exochosphaeridium Davey et al. (1966), Cordosphaeridium Eisenack (1963b) and an intermediary genus Amphorosphaeridium nov. Morphological changes exhibited by the cysts are related to ecological considerations and are shown to be directional; their stratigraphic usefulness is also discussed. In all one genus, three species and two varieties are erected.Item Some dinoflagellate cysts from the upper Cretaceous of northern Natal, South africa(Bernard Price Institute for Palaeontological Research, 1969) Davey, Roger J.Fossil dinoflagellate cysts are for the first time described from South Africa and occur in sediments of Campanian, Maastrichtian and possibly Danian age. The sedimentary samples are from a borehole in northern Natal. The systematic section includes the erection of seven new species; these constitute only a few of the many species found in the assemblages.Item Gonyaulacysta parorthoceras A new species if dinoflagellate cyst(Bernard Price Institute for Palaeontological Research, 1968) Davey, Roger J.Davey (1968 in press) emends the species Gonyaulacysta orthoceras Eisenack and also transfers it to the genus Cribroperidinium Neale and Sarjeant. By emending Eisenack's species the specimens described by Sarjeant (1966) as G. orthoceras, from the Lower Cretaceous of England, must now be excluded from this species. Hence, a new species is here erected to accommodate them.Item THE EVOLUTION OF CERTAIN UPPER CRETACEOUS HYSTRICHOSPHERES FROM SOUTH AfRICA(BERNARD PRICE INSTITUTE FOR PALAEONTOLOGICAL RESEARCH, 1969) Davey, Roger J.This paper traces clearly, for the first time, an evolutionary sequence in dinoflagellate cysts. The sedimentary samples containing the cysts are from northern Natal, South Africa, and are of Upper Cretaceous age. The genera concerned in this study are Exochosphaeridium Davey et al. (1966), Cordosphaeridium Eisenack (1963b) and an intermediary genus Amphorosphaeridium nov. Morphological changes exhibited by the cysts are related to ecological considerations and are shown to be directional; their stratigraphic usefulness is also discussed. In all one genus, three species and two varieties are erected.Item SOME DINOFLAGELLATE CYSTS FROM THE UPPER CRETACEOUS OF NORTHERN NATAL, SOUTH AFRICA(BERNARD PRICE INSTITUTE FOR PALAEONTOLOGICAL RESEARCH, 1969) Davey, Roger J.Fossil dinoflagellate cysts are for the first time described from South Africa and occur in sediments of Campanian, Maastrichtian and possibly Danian age. The sedimentary samples are from a borehole in northern Natal. The systematic section includes the erection of seven new species; these constitute only a few of the many species found in the assemblages.Item GONYAULACYSTA PARORTHOCERAS: A New Species of DINOFLAGELLATE CYST(BERNARD PRICE INSTITUTE FOR PALAEONTOLOGICAL RESEARCH, 1968) Davey, Roger J.Davey (1968 in press) emends the species Gonyaulacysta orthoceras Eisenack and also transfers it to the genus Cribroperidinium Neale and Sarjeant. By emending Eisenack's species the specimens described by Sarjeant (1966) as G. orthoceras, from the Lower Cretaceous of England, must now be excluded from this species. Hence, a new species is here erected to accommodate them.