Figure. Left - Comparison of the size of a large arm sucker (left) to a club sucker (right). Right - The inner ring of the large arm sucker shows a pattern of blunt teeth seemingly imprinted on the smooth ring.
Figure. Left - An oblique view of the same arm sucker. Right - The same view enlarged. The irregular tooth impressions are more apparant in this view.
Figure. Left - Oral view of the club sucker. Right - Oblique view of the club sucker. The sucker shows teeth marks similar to those of the arm suckers but more pronounced and the inner ring margin also is more irregular.