Parasitic Isopods

This chart appears to place a copepod (1) with parasitic representatives of the order Isopoda.  The Suborder Cymothoida and some other Isopod families parasitise as ectoparasites grazing on mucus and skin or as endoparasites sitting in the mouth/pharynx of a fish collecting food.  this chart shows some common body forms.  note how the legs are repeated at each segment compared to those of amphipods which are modified for different tasks on different segments (2-8).