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The microfilaria of Wuchereria bancrofti is seen in this image from a bone marrow aspirate(JennerGiemsa). These are sheathed and have a gently curved body and a tail that is tapered to a point. The nuclear column that is the cells that constitute the body of the microfilaria are loosely packed and do not extend to the tip of the tail. The presence or absence of a sheath and the pattern of nuclei in their tail are the main features used to distinguish the various species.