Chemotaxonomy of Gyrocotyle (Platyhelminthes: Cercomeria) species, parasites of chimaerid fish (Holocephali), by chemometry of their fatty acids

摘要: The validity of some morphological gyrocotylid species, exclusive gut parasites ratfishes (Holocephali), is contested. Non-morphological characters, such as fatty acid profiles, may be used to resolve taxonomic problems. FiveGyrocotyle species were studied: three inChimaera monstrosa collected between 1985 and 1987 from the north-east Atlantic (on Norwegian coast); two inHydrolagus colliei, in Pacific (in Nanaimo, British Columbia, Canada). Their acids obtained by methanolytic extraction worm tissue samples, followed gas chromatography methyl esters, finally multivariate data treatment (principal component analysis) chromatographic results. Complete separation five was obtained; classification agrees well with that arrived at morpholog enzyme electrophoresis.