Antennae, an important sensory organ of terrestrial isopods, are often attacked and amputated by predators or members of the same species. The regeneration of amputated limbs is associated with molting. The aims of our work were to find out: I) whether amputation of the antenna affects the length of the moult cycle; II) whether the regenerated antennas differ dimensionally from the original; III) whether the number of sensory elements on the regenerated antennae differs from the original. One day after molting the antenna of adult isopods Porcellio scaber was amputated and changes of the stump were monitored throughout the molting cycle. After successful regeneration, the regenerate was amputated again. Thus we obtained the original antenna and two regenerates of the same specimen. Light microscope photographes of antennae were analysed for a dimensional comparison of the last three articles. On SEM micrographs we analysed the size, shape and number of sensory structures of the original and regenerated antennae. Amputation of the antenna on the third article was followed by self-amputation between the first and second article. Until molting, regeneration took place inside the stoup closed with a pigmented scab. The length of the molting cycle has not changed. The regenerated antenna was always shorter and narrower than the original one. The number of aesthetascs was generally smaller on the regenerate, and the density of tricorns was also often reduced, while the length of the apical organ and other sensilla generally did not differ.
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