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Palynology; 2000; v. 24;1; p. 21-35; DOI: 10.2113/0240021
© 2000 American Association of Stratigraphic Palynologists
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A TAXONOMIC STUDY OF THE DINOFLAGELLATE CYST MUDERONGIA SIMPLEX ALBERTI 1961 AND RELATED SPECIES

JAMES B. RIDING

British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom, e-mail: j.riding{at}bgs.ac.uk

NIELS E. POULSEN

Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark, e-mail: nep{at}geus.dk

DAVID A. BAILEY

BioStrat Services Limited, 1 Chapelstone Cottages, Finstwaite Lane, Backbarrow, Ulverston, Cumbria LA12 8PY, United Kingdom, e-mail: davebailey{at}compuserve.com

Following a restudy of the type material of Muderongia simplex Alberti 1961, this species and the informally-named Volgian morphotype Muderongia sp. A of Davey (1979) are deemed to be unequivocally conspecific. They both have angular endocysts, the extremities of which extend into the pericystal horns, thereby engendering a cornucavate cyst organisation. The specific diagnosis of Muderongia simplex is emended to note this morphologic phenomenon. The distinctive Lower Cretaceous (Ryazanian to Hauterivian–Barremian) circumcavate representatives of Muderongia which have been extensively referred to as Muderongia simplex in the literature are assigned to the new species Muderongia endovata. The distinction between the genera Muderongia and Phoberocysta is maintained, contrary to a recent synonymisation.




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