Fol, 1872
Trunk up to 1.1 mm long, with its oral part depressed, and genital part spherical. Mouth wide, without lips, with a ring of ciliated cells, and 8 bristle cells. Esophagus extremely short. Stomach to the left, nearly spindle shaped. Intestine very short. Rectum large and spherical. Gonads spherical. Testis on the right side of the body, ovary on the left. Tail 7 to 10 times longer than the trunk, musculature very narrow.