Badets M. auteur aut IRD Boissier J. auteur aut IRD Brémond Philippe auteur aut IRD Verneatu O. auteur aut IRD text journalArticle eng text/pdf born digital access Among monogeneans that display direct life cycles, plastic developmental strategies may have been selected to counter the lack of transmission opportunities. Within amphibian polystomatids, some species of the genus Polystoma develop into two different phenotypes depending on the host physiological stage to which free swimming larvae attach. When oncomiracidia infest old tadpoles, they develop slowly and migrate during host metamorphosis towards the bladder where they reach maturity. On the other hand when larvae infest young tadpoles, they develop rapidly into neotenic phenotypes that reproduce in the branchial chamber. These alternative developments are explored through experimental infestations with Polystoma gallieni, the specific polystome of the stripeless tree frog Hyla meridionalis. When oncomiracidia were left for 6 h in water in which young tadpoles had been previously maintained for one day, they mainly developed into the neotenic phenotype regardless of the tadpole stage they encountered later. This indicates that P. gallieni could collect released host-derived signals before physical contact with its host. specialized Monogenea Polystomatidae Polystoma gallieni Amphibia Hyla meridionalis Developmental plasticity Host-derived signals 052 121 2 163-166 2009 0014-4894 https://www.documentation.ird.fr/hor/fdi:010046081 10.1016/j.exppara.2008.10.013 0014-4894 [F B010046081] https://www.documentation.ird.fr/hor/fdi:010046081 https://www.documentation.ird.fr/intranet/publi/2009/compl1/010046081.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2009-07-08 2017-08-23 fdi:010046081 fre