FIGURE 5. A in The taxonomic value of the structures for the insertion of the stylet muscles in the Eutardigrada, and description of a new genus

FIGURE 5. A, Buccal tube of Acutuncus and, B, Ramazzottius (Hypsibiidae); arrows indicate the hook-shaped dorsal and ventral AISM. C, Buccal tube of Fractonotus (Microhypsibiidae) and, D, Calohypsibius (Calohypsibiidae); arrows indicate the hook-shaped dorsal AISM followed by a longitudinal thickening of the buccal tube wall, and the ridge-shaped ventral AISM. Scale bar = 10 µm.