983 Cenozoic diatom genus Bogorovia Jouse : An emended description

抄録

An emended definition of the fossil diatom genus Bogorovia Jouse is presented along with a detailed description of eight species. The stratigraphic range and geographic distribution of each species are provided based on analysis of deep-sea cores and literature survey. The genus is closely related to the genus Ressiella Desikachary et Maheshwari, but is distinguished from the latter mainly by the presence of transapical costae. It also shows a close resemblance to Koizumia Yanagisawa, but differs mainly by the structure of the marginal ridge. On the basis of certain characteristic features, the genus Bogorovia can be placed in the family Cymatosiraceae Hasle, von Stosch et Syvertsen. Four new species are described and two new combinations are established; Bogorovia barronii Yanagisawa sp. nov., B. curvata Yanagisawa sp. nov., B. puncticulata Yanagisawa sp. nov., B. rostrata Yanagisawa sp. nov., B. gombosii (Desikachary) Yanagisawa comb. nov. and B. lancettula (Schrader) Yanagisawa comb. nov.