Graphics representing the main components of the attachment clamps of Omanicotyle heterospina n. gen. et n. comb. a, Median view. The clamp is in an upright position, the sclerites on the edge marked “x” open and attach to the secondary lamellae of the host’s gills. Large muscles (m) linking the sclerites, whilst others (not shown) run throughout the tegument that encases the entire clamp apparatus. b, medio-lateral view. c, median view of a clamp in the closed or “clamped” position. Supporting muscles that run through the tegument are shown. d, medio-ventral view of a closed clamp; e, median view of a clamp in the open position. f, medio-ventral view of an open clamp.