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Description of CochlosomaSmall flagellates (6-18 µm) anteriorly truncated by a spiraled adhesive disk. From a cleft on the disk, a lateral groove develops along the length of the body. The six flagella arise from the cleft and are deflected backward. A recurrent flagellum is associated with the dorsal left margin of the lateral groove, as in undulating membranes, and terminates by a free posterior portion. Four flagella are free and the fifth emerges independently or dorsally. An axostyle originating near the basal bodies traverses the cell and protrudes posteriorly. A parabasal body situated near the anterior nucleus has been described. Among the seven species reported, five occur in the intestine of birds, such as ducks, turkeys, American magpies, eastern robins, and Turdus, and possibly one in bats (Kotlan, 1923, Kimura, 1934, Travis, 1938, Kulda and NohynkovÃ, 1978). The scanning electron microscopic study (Watkins et al., 1989) has confirmed the external morphology of the disk and the groove, the number of flagella, the recurrent flagellum attached to the rim of the lateral groove, and the posterior axostyle. EM study clearly shows the trichomonad characters of this genus and of the family (Pecka et al 1996).