Apoamphiseilla tihanyiensis (Géllert & Tamás, 1958) Foissner, 1997

Hu, Xiaozhong & Kusuoka, Yasushi, 2015, Two Oxytrichids from the Ancient Lake Biwa, Japan, with Notes on Morphogenesis of Notohymena australis (Ciliophora, Sporadotrichida), Acta Protozoologica 54 (2), pp. 107-122 : 120

Comparison of Apoamphiseilla tihanyiensis with previous descriptions

The present species was identified as Apoamphisiella tihanyiensis because it fits well with previous descriptions ( Berger 1999; Paiva et al. 2004). So far this species has been recorded from Europe, South America, and Asia, which might implies that it has a cosmopolitan distribution. Morphometric comparison can only be made among four populations ( Gellért and Tamás 1958; Foissner 1997; Paiva et al. 2004). The Japanese population is smaller than the European one after fixation (ca. 156 μm long vs. ca. 220 μm long; Gellért and Tamás 1958), bigger than the Brazilian population (ca. 156 μm long vs. ca. 134 μm long; Paiva et al. 2004), but similar to the Peruvian population in cell length (vs. 147–190 μm; Foissner 1997). The present population has fewer adoral membranelles than earlier strains (mean of 44 vs. 50, 57 and 57), but values overlap to some extent. The numbers of buccal and frontal, and of cirri in the frontoventral and marginal rows are relatively stable among populations; by contrast, other morphometric features, for example the numbers of frontoventral, ventral, and caudal cirri, are highly variable in the present population, but within the range of the other three populations. All these justify conspecificity of these morphotypes.