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Parallel fibres in the joint head of a terrestrial isopod leg. (a) A scanning electron micrograph of the joint on the leg basis in Porcellio. (b) A fractured joint head displaying the Bouligand structure in the central region and bundles of circumferentially oriented fibres near the edge. (c) A higher magnification scanning electron micrograph of the circumferential fibres, showing their parallel arrangement. Images were obtained as detailed in Vittori et al. [8].
