The role of the endocrine system in the regulation of reproduction in terrestrial pulmonate gastropods

In this paper we review the current state of knowledge about the endocrine system, its interactions and its putative role in the regulation of reproduction in terrestrial pulmonate gastropods. Within this context, we review the possible endocrinological role of the optic tentacles, the dorsal bodies cells, the gonad, and certain groups of neurosecretory cells. In addition, we discuss the possible chemical nature of some of the hormones that may be involved in regulating reproductive processes in slugs and snails. This review emphasizes the fact that most of the research on the reproductive physiology of terrestrial snails and slugs is now somewhat dated, end that many of the questions that emerged during the 1970s, 1980s and early 1990s remain unanswered. This review also highlights the continuing general lack of knowledge about the reproductive physiology of terrestrial pulmonate gastropods, by comparison with our understanding of these processes in freshwater representatives of this subclass. This disparity leads us to conclude that more research into the physiology of terrestrial pulmonate gastropods is needed in order to understand these processes in molluscs as a group. Finally, the possibility that the gastropod endocrine system could be targeted in order to develop precise, species-specific and more environmentally friendly control methods against terrestrial gastropod pests is also discussed.