Volume 52/Number 1/Abstract 1
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Acta Parasitologica, Vol. 52, No. 2, 2007, 89–103. DOI: 10.2478/s11686-007-0016-1
Göran Malmberg1*, Catherine M. Collins2, Carey O. Cunningham2 and Behiar J. Jalali3Gyrodactylus derjavinoides sp. nov. (Monogenea, Platyhelminthes) on Salmo trutta trutta L. and G. derjavini Mikailov, 1975 on S. t. caspius Kessler, two different species of Gyrodactylus - combined morphological and molecular investigations

1 Department of Zoology, Stockholm University, S-106 91 Stockholm, Sweden;
2FRS Marine Laboratory, P.O. Box 101, Victoria Road, Aberdeen, AB11 9DB, UK;
3 Veterinary Department, Research and Science Branch, Islamic Azad University, P.O. Box 14515 775 Teheran, Iran
*Corresponding author: goran.malmberg@zoologi.su.se
The paper deals with two morphologically similar but molecularly clearly different species of Gyrodactylus: G. derjavinoides sp. nov. on Salmo trutta trutta L. in Western Europe and G. derjavini Mikailov, 1975 collected on Salmo trutta caspius Kessler in Iran. The new species is described and its opisthaptoral hard parts compared to those of G. derjavini. Our molecular analysis of G. derjavinoides and G. derjavini confirmed that the morphological differences between them are species differences and not intraspecific variations. Phylogenetic analysis using the ITS rDNA region placed both species within the subgenus G. (Limnonephrotus) and within the G. wageneri-group, quite in accordance with morphological results. The two species, however, did not cluster as sister taxa. The correspondence between molecular-based clades within G. (Limnonephrotus) and the morphological shapes of marginal hooks within these clades are discussed. The importance of combined molecular and morphological analyses when describing or redescribing Gyrodactylus species is stressed.
KEY WORDS: Platyhelminthes, Monogenea, Gyrodactylidae, Gyrodactylus sp. nov., fish, Salmo trutta, Western Europe, Iran

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