Species separation among some brightly coloured marine Pseudokeronopsis spp. is difficult because of the accumulation of inaccurate descriptions or misinterpretations in previous studies. Based on isolates collected from Chinese coastal waters, four ”well-known” yellow, brown or reddish species, i.e. P. carnea, P. flava, P. flavicans, and P. rubra, are re-examined, particularly with respect to their cortical granules, cell colour, infraciliature and other morphological features in vivo. Improved diagnoses for these organisms are given, synonyms are listed and a key to their identification is supplied. A recently reported marine form, Pseudokeronopsis pararubra Hu, Warren et Suzuki, 2004, is believed to be a junior synonym of P. carnea and is synonymized with the latter.
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