Abstract
Abstract The regulation of the hydric content in three species of terrestrial oligochaetes, Eiseniella tetraedra, Allolobophota motteri and Eisenia foetida, when submerged in water has been investigated. The experiments have been carried out using mature and young worms, complete and decerebrated specimens and under light and in darkness. The study revealed that the cerebral ganglia, as well as light, are involved in the osmoregulatory physiology of these worms. It also appears that lack of food does not affect the development and maintenance of the clitellum, while light and neuro‐hormonal factors do.
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