The seven pairs of legs are much alike. The abdomen is a simple box with the gills encosed by valves on the underside formed from the uropods. The colour of Euidotea peronii , a species growing up to 44 mm long, is extremely variable. Paridotea collingei is narrower, a similar length and more evenly coloured red.
Sea centipedes live and feed on decaying seaweed in shallow waters of southern Australia.
These species belong to one of the few families of herbivorous isopods. They can camouflage themselves according to the colour of the marine algae in which they live.