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Abstract
The morphology, reproduction and taxonomy of Pandorina colemaniae Nozaki sp. nov. (Volvocaceae, Chlorophyta) were studied using clonal cultured materials from Okayama Prefecture, Japan. This species is distinguished from other Pandorina species by its 8- or 16-celled vegetative colonies, in which multipyrenoid cells are arranged compactly and are contiguous in the centre. The cellular and colonial organization observed with light and electron microscopy and the mode of asexual reproduction suggest that P. colemaniae is closely related to the type species, P. morum (O.F. Müller) Bory. A synoptic key to the species of Pandorina is provided.