morphological and molecular evolution are not linked in lamellodiscus (plathyhelminthes, monogenea)形态学和分子进化与lamellodiscus(plathyhelminthes单殖亚纲).pdfVIP

Morphological and Molecular Evolution Are Not Linked in Lamellodiscus (Plathyhelminthes, Monogenea) ´ 1,2 3 1,2 Timothee Poisot *, Olivier Verneau , Yves Desdevises ´ ´ 1 UPMC Univ Paris 06, UMR 7232, Biologie Integrative des Organismes Marins, Observatoire Oceanologique, Banyuls-sur-Mer, France, 2 CNRS, UMR 7232, Biologie ´ ´ Integrative des Organismes Marins, Observatoire Oceanologique, Banyuls-sur-Mer, France, 3 UMR 5110 CNRS-UPVD, Centre de Formation et de Recherche sur les ´ ´ ´ Environnements Mediterraneens, Universite de Perpignan Via Domitia, Perpignan, France Abstract Lamellodiscus Johnston Tiegs 1922 (Monogenea, Diplectanidae) is a genus of common parasites on the gills of sparid fishes. Here we show that this genus is probably undergoing a fast molecular diversification, as reflected by the important genetic variability observed within three molecular markers (partial nuclear 18S rDNA, Internal Transcribed Spacer 1, and mitonchondrial Cytochrome Oxidase I). Using an updated phylogeny of this genus, we show that molecular and morphological evolution are weakly correlated, and that most of the morphologically defined taxonomical units are not consistent with the molecular data. We suggest that Lamellodiscus morphology is probably constrained by strong environmental (host-induced) pressure, and discuss why this result can apply to other taxa. Genetic variability within nuclear 18S and mitochondrial COI genes are compared for several monogenean genera, as this measure