Abstract
Abstract The morphology of the lateral‐line system of the nine‐spined stickleback (Pungitius pungitius) and the three‐spined stickleback (Gasterosteus aculeatus) has been studied. In the nine‐spined stickleback, a preopercular, infraorbital, supraorbital, postotic and peduncular canal can be identified on both sides of the body. Replacement lines are found as a continuation of the preopercular and infraorbital canal. In addition, lines of free neuromasts are found on the mandible and trunk. An accessory line is present above and below the peduncular canal. The presence of both canals and accessory lines on the peduncle suggests that the peduncle in this species has important sensory functions. No canals are found in the three‐spined stickleback. Instead, replacement lines corresponding to the canals can be identified on the head. Accordingly, the lateral‐line system of the three‐spined and the nine‐spined stickleback has a different structure. The lateral‐line system of both species shows signs of specialization but the three‐spined stickleback has a more specialized lateral‐line system than the nine‐spined stickleback.
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