Abrochtha intermedia: ventral view of swiming specimen; 3 different focal planes. Upper left: focal plane on the (optical transectof the) rostrum with mnny cilia. The trochal cilia (Tr) show the regular dexioplectiv metachronal waves in a semicircle around the trochal discs, but not in the area between the arrowheads. The cilia that are proximal to the mastax (rCi/ lCi) show the bilaterally symmetric metachronal waves that are typical for the cingulum of other bdelloids. Upper right: focal plane more dorsal; the Cilia in the area BF do not show metachronal waves which is typical for the cilia of the buccal field of other bdelloids. Cilia of the buccal tube (BT) show the bilaterally symmetric metachronal waves. Lower left: focal plane on the cilia of the buccal tube. The behavior of the cilia is in accordance with the drawing of DeBeauchamp (1909). Specimen from (6).