The dinoflagellate cyst genus Epiplosphaera Klement 1960 and its species have been studied in material from the Oxfordian and Kimmeridgian of Poland. The taxonomic history of the genus is summarized and the morphology is discussed. The type species Epiplosphaera bireticulata differs from other representatives of the genus in having high septa which are dissected distally. Additional septa in E. bireticulata form a second reticulum inside the parasutural septa. Epiplosphaera reticulata differs from the other species by having low spines and low, smooth septa. The septa form a second reticulum within the parasutures, as in the case with E. bireticulata. Epiplosphaera areolata has high spines, but almost no reticulum or parasutures. Epiplosphaera reticulospinosa is intermediate between E. bireticulata and E. areolata. It has a mixture of both high and low septa between the spines. Epiplosphaera gochtii has low spines and few, low septa between some of the spines. Epiplosphaera ornata is regarded as a junior synonym of E. gochtii.
- Received April 1, 1991.
- Revision received February 1, 1992.
- © 1992 The Micropalaeontological Society