This type of movement appears similar to the undulating membrane of the sexually-transmitted pathogen " Trichomonas vaginalis " and can result in a false-positive diagnosis in cases where " B . saltans " is a contaminant in test samples, especially if a nonsterile saline solution has been used.
4.
All members of the genus possess a long series of membranelles on the left side of the oral groove, and an " undulating membrane " ( a structure resembling a flap, scarf or small sail, composed of long cilia fused together as a single sheet ) on the right side of the peristome, toward the posterior.