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- Argulus japonicus is a fish louse (a branchiuran crustacean) that parasitises a wide range of freshwater fish hosts.
- It has a flattened body and can be up to 9mm in length.
- The head extends back into pair of carapace lobes that completely conceal the thorax and its 4 pairs of swimming legs.
- The bilobed abdomen is visible at the rear end of the body.
- Males are similar to females in body shape, although usually a little smaller. The third and fourth swimming legs of males are modified for sperm transfer during mating.
- Juvenile Argulus attach to the host by means of claws on their head limbs, but adults attach by means of a huge pair of modified suckers.