Morphology and Infraciliature of <i>Trochiliopsis australis</i> N. Sp., <i>Pelagohalteria viridis</i> (Fromentel, 1876) N. G., N. Comb., and <i>Strobilidium lacustris</i> N. Sp. (Protozoa, Ciliophora)¹

Abstract

ABSTRACT Three ciliate species from Australia and Norway were examined by silver impregnation, biometry, and scanning electron microscopy. Trochiliopsis australis n. sp. (order Nassulida, family Microthoracidae) differs from the single other known species of the genus, T. opaca , by its prominent ridges on the left side, the distinctly longer anterior segment of somatic kinety 2, and by the doubled total number of kinetosomes. Pelagohalteria n. g. (order Oligotrichida, family Halteriidae) differs from Halteria by the structure of the bristle complexes, which are composed of a vertically and a horizontally oriented row of kinetosomes. Two Halteria species belong to the new genus: P. viridis (Fromentel, 1876) n. comb., which is redescribed here, and P. cirrifera (Kahl, 1935) n. comb. Strobilidium lacustris n. sp. (order Oligotrichida, family Strobilidiidae) differs from its nearest relative, S. velox , by the smooth pellicle, the absence of symbiotic green algae, and by its larger size.