Xu and Song (1999)described a Jiaozhou population in which a single longitudinal row with eight or nine basal bodies in M1 is present.The character is also consistent with the population studied by of Foissner (1971), in which he synonymized Parauronema with Uronema, based on Parauronema having a very similar morphology to Uronema and the only exception being atwo-rowed M1 (vs. one-rowed). Considering P. acutum and P.longum were reported also with two longitudinal rows in M1,more evidence is needed to validate whether Parauronema is a junior synonym of Uronema.