Trichodina algonquinensis, a new species of peritrich ciliate from Ontario freshwater fish, and observations on its transmission

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Abstract
Trichodina algonquinensis n. sp. is described from the urinary bladder and ureters of the perch (Perca flavescens) and the common shiner (Notropis cornutus) from Lake Sasajewun, Algonquin Park, Ontario. The ciliate is hat shaped, flattened, and ellipsoidal in lateral view. The mean diameter of the oral portion of the body is 88.4 μm (58.5–123.5 μm; n = 21) and of the adhesive disc, 54.9 μm (42.9–57.2 μm; n = 30). It has 38 (35–42; n = 17) denticles, a horseshoe-shaped macronucleus, a round to ovoid micronucleus situated near the end of one arm of the macronucleus, and the oral groove spiral is 540°. Experiments indicate that in aquaria the ciliate is readily transmitted from perch to common shiners and golden shiners (Notemigonus crysoleucas) but not to creek chub (Semotilus atromaculatus).

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