Polymorphismes phénotypique et enzymatique : intérêt et limites dans la description d'espèces d'Helicometra (Trematoda, Opecoelidae), mésoparasites de téléostéens marins.

• Published in: Systematic Parasitology
• Main Authors: Reversat, Jérôme, Maillard, Claude, Silan, Patrick
• Other Authors: Laboratoire de Parasitologie comparée, Université Montpellier 2 - Sciences et Techniques (UM2), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: French
• Published: HAL CCSD 1991
• Subjects: Trematoda; Opecoelidae; Helicometra pulchella; Helicometra gobii; Helicometra fasciata; Symphodus cinereus; Gobius niger; Zosterisessor ophiocephalus; Anguilla anguilla; taxonomy; polymorphism; Mediterranean sea; [SDV.MP.PAR]Life Sciences [q-bio]/Microbiology and Parasitology/Parasitology; [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics; Phylogenetics and taxonomy; [SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal genetics
• Online Access: https://hal.science/hal-01070949; https://doi.org/10.1007/BF00009909

International audience Three trematodes belonging to the genus Helicometra from the "Golfe du Lion" (Etang de Thau, France) are identified and renamed on the basis of isoenzyme electrophoresis (Reversat et al., 1989). After the bibliographical review of the genus Helicometra in the Mediterranean basin, the following results are proposed: (1) the specimens which possess the allele MDH-1a are only found in Symphodus cinereus (Labridae) : this taxon is considered to belong to Helicometra pulchella (Rudolphi, 1819) Odhner, 1902 (2) the trematodes bearing the allele MDH-1b parasitise S. cinereus, Gobius niger (Gobiidae), Zosterisessor ophiocephalus (Gobiidae) and Anguilla anguilla (Anguillidae) : these helminths are defined as Helicometra gobii (Stossich, 1883) Stossich, 1904 (3) and the digeneans defined genetically by the alleles MDH-1c and MDH-1d are found in A. anguilla, G. niger and Z. ophiocephalus, and are named Helicometra fasciata (Rudolphi, 1819) Odhner, 1902. The importance of the biochemical genetics for the study of taxonomy of trematodes is shown, but the problems these techniques raise are also discussed. The case of Helicometra gobii is typical : it exhibits a strong phenotypical polymorphism for an enzymatic type (MDH-1b). The problem of diagnostic characters for species definitions is therefore introduced.