Abstract
We present a morphometric study comparing three Apoamphisiella species from Brazil. A. jurubatiba and A. tihanyiensis from Cabiúnas Lagoon (Macaé - Rio de Janeiro), and A. foissneri sp. n. from Limoeiro River (Além Paraíba - Minas Gerais). This new species was approximately 150 x 70μm in vivo, and was characterized by having two postperistomial cirri, two contractile vacuoles, and no cortical granules. In contrast, both A. jurubatiba and A. tihanyiensis had cortical granules and a single contractile vacuole. Furthermore, A. jurubatiba had three posterior frontal cirri and its right marginal cirral row started in the dorsal surface, whereas A. tihanyiensis had two posterior frontal cirri. Moreover, the dorsal ciliature pattern was also different among the three species.
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