Great Basin Naturalist


A total of 181 fishes belonging to 10 species were captured near Richfield, Utah, and examined for parasites. A new species of hemoflagellate, Trypanoplasma atraria sp. n., was observed in 3 species: Utah chub (Gila atraria [Girard]), redside shiner (Richardsonius balteatus [Richardson]), and speckled dace (Rhinichthys osculus [Girard]). Seven other species of fishes examined in the study area were negative for T. atraria sp. n. The salmonid leech, Piscicola salmositica (Meyer), collected in the same area harbored developmental stages of Trypanoplasma, suggesting a possible leech vector for the hemoflagellate. Characteristics of Trypanoplasma atraria sp. n. place it near T. salmositica, but the new species is twice as large.