as well as the popula-tion of Song and Wilbert (2000), with only small differencesin body size: 45–70 × 20–35 ?m vs. 60–100 × 25–45 ?m inthe original population vs. 25–40 × 10–15 ?m in Song andWilbert (2000). The cell shape of the Jiaozhou populationis rather similar with that described in Wilbert and Kahan(1981): body asymmetric when viewed ventrally with a small,truncated apical plate (Fig. 4I, M). Xu and Song (1999)described a Jiaozhou population in which a single longitu-dinal row with eight or nine basal bodies in M1 is present.The character is also consistent with the population studied byof Foissner (1971), in which he synonymized Parauronemawith Uronema, based on Parauronema having a very simi-lar 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 isa junior synonym of Uronema.