Fig. 6

Ultrastructure of clamp II. a A clamp sclerite limited distally by the outer layer, with a sclerite lumen inside. b A section through the muscle fibers enabling sclerite movement. The muscle fibers are attached to the sclerite on its outer layer. c Terminal part of the sclerite with its hooked tip. d Detail of the terminal part of the anterior joining sclerite. A large nerve fiber is located on the terminal part of the sclerite. Abbreviations: EPM, external plasma membrane; Mi, mitochondria; MF, muscle fibers; Neo, neodermis; NP, nerve fiber; Sc, sclerite; SL, sclerite lumen; SOL, outer layer; TSc, terminal part of the sclerite; V, vesicles