Stichotricha aculeata (WRZEÅNIOWSKI,1866).AZM=adoral zone of membranelles;DK=dorsal kinety;CR=2 of the 4 cirral rows;UM=undulating membrane;EOM=endoral membrane.Protargol protocol A (see Foissner, W. Europ. J. Protistol., 27:313-330;1991).Brightfield.