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The present study describes a new species of  Trichodina  found in the mucus of the body surface of 137 farmed and wild silver catfish ( Rhamdia quelen ) located in southern Brazil and in the gills of 99 banded knife fish ( Gymnotus  sp.) captured in the basin of Pantanal. Smears of the body surface mucus and gills were air dried at room temperature and impregnated with silver nitrate and stained with Giemsa for analysis of the adhesive disc, denticles and macronucleus. Characterized as a medium trichodinid,  Trichodina quelenii  n. sp. resembles  T. heterodentata  and  T. acuta . It differs from  T. heterodentata  by the shape of the blade and from  T. acuta  by the lack of central circle. Furthermore, the distinct shape of the blade of  T. quelenii  n. sp. differs from all previously described species for the genus, leaving no doubt it is a new species.

acta parasitologica

A new species of  Trichodina   Ehrenberg, 1830 (Ciliophora: Trichodinidae) from  Rhamdia quelen  (Siluriformes: Heptapteridae) and  Gymnotus   sp. (Teleostei: Gymnotidae) in Brazil