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Morphological structure of the barnacle Semibalanus balanoides. (a) Transverse view of the six wall plates that make up the barnacle conical structure. Alae between adjacent wall plates are highlighted by red arrows, radius on neighbouring plates by black. (b) Longitudinal internal view through adjacent wall plates (adapted from Murdock and Currey [17]). Insets illustrate morphological differences of the ala at different points of the interlock. (Online version in colour.)
