Abstract
The microhabitat and morphology ofGrubea cochlear(Monogenea), a rare gill parasite of Atlantic mackerel (Scomber scombrus), were investigated for a sample of fourteen parasite individuals obtained from Lyme Bay, southern England.Grubea cochlearshowed a preference for the inner hemibranch of the fourth gill arch, this localization contrasting with that of the related and sympatric speciesKuhnia scombri. The morphology ofG. cochlearin this sample differed slightly from some of the previously documented specimens, especially with regard to the number of small genital hooks and the relative size of the haptor. It is suggested that geographical morphological variation may occur in this species.
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