Abstract
Mature eggs stored in the lateral oviducts are unusual in Carausius morosus. When egg laying is experimentally prevented, ovarian production is inhibited by the accumulation of mature eggs within the lateral oviducts. Such storage affects only the very small terminal oocytes and not the vitellogenic follicles, which attain to term and are ovulated. The fact that unilateral retention of eggs affects only the corresponding ovary strongly suggests that the mature eggs themselves inhibit ovarian production in the stick insect without the involvement of an endocrine organ. It is likely that this mode of action, different from that suggested for the housefly or Rhodnius prolixus, is correlated with the independence of ovarian development from the corpus allatum hormone in the stick insect.
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