Light micrograph of the thorax area of the carp aphid. The carp louse (Argulus foliacaeus) is a fish parasite from the group of fish lice or Branchiura. In the focus of the ventral side two suckers are to be recognized here on the right and on the left at the edge of the picture. The two dark complex eyes are located on the dorsal side of the animals and can be seen here out of focus. Furthermore different hooks are to be recognized, adapted to the parasitic way of life of the animals. Microscopic contrast method : dark field. Magnification 100x at a print width of 10 cm.