Uma nova espécie de Trichodina Ehrenberg, 1838 (Ciliophora: Trichodinidae) em Biomphalaria schrammi (Crosse, 1864) (Mollusca: Planorbidae)

Abstract

A new species of Peritrichida found in Biomphalaria schrammi (Crosse, 1864) is described. This new species is characterized by a reticular central area of the adhesive disc and a horseshoe-shaped macronucleus, a 80.0 ± 7 μm-diameter celular body and a 41.4 ± 2.9 μm adhesive disc; it shows 19-32 (27±3) 13.1 ± 1.1 μm - long denticle, and 8 ± 1 6.6 ± 1.1 μm - long radial pins per denticle, being different from other already described Trichodina. This is the first report of simbiontic interaction among trichodinid and molluscs of the genus Biomphalaria in Brazil. Keywords: Ciliophora, Peritrichidae, Gastropoda, Biomphalaria schrammi, Trichodina machadoi sp. n.