Three species are known to occur in UK freshwaters: Argulus foliaceus, Argulus coregoni and Argulus japonicus. Two of these species, A. foliaceus and A. coregoni, are regarded as native to the UK Fig. 1. These species are easily discriminated since adult A. coregoni are over twice the size of adult A. foliaceus and have pointed, rather than rounded, abdominal lobes. A. japonicus is thought to be nonnative and introduced from Asia through the ornamental trade. This species looks very similar to A. foliaceus and can only be discriminated at the microscopic level.

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