文摘
The dinocyst genus Montanarocysta Corradini is emended, based on re-examination of the holotype, the paratype and well-preserved specimens of the type species, Montanarocysta aemiliana Corradini. This re-examination shows that M. aemiliana has a sexiform gonyaulacacean tabulation incompletely delineated by processes and septa, a large untabulated ventral area, an apical archeopyle type (tA)a with well-developed precingular accessory sutures, and a simple adnate operculum attached to the sulcal as and precingular plates 1&z.aacute; and 6&z.aacute;. Maghrebinia chleuh Below and Maghrebinia mirabilis (Below) Masure are here transferred to Montanarocysta, since they have closely similar morphology to M. aemiliana. Previously Atopodinium Drugg has been considered as taxonomic senior synonym of Maghrebinia Below and Bejuia Stover Williams, and the species in these two genera have been transferred to Atopodinium. From the present analyses, Atopodinium is separated from Montanarocysta on the ornamentation: Atopodinium has a more subdued ornamentation, consisting of ridges, folds, grana and gemmae; whereas Montanarocysta is characterised by processes and septa. Maghrebinia is herein retained as separate genus, which has a ceratocoryacean tabulation and contains the single species Maghrebinia perforata Below.
