Food preferences Food preferences of British nudibranchs.
They usually have sheaths around the rhinophores. Most species feed on soft corals, anemones or hydroids. True dorids such as Archidoris have broad radulae with typically 20-60 teeth per row and feed on sponges. Phanerobranch dorids such as Polycera and Onchidoris have narrow radulae typically with two principal teeth and usually a series of smaller hooks or plates. They feed on Bryozoans or Tunicates and a few have odd diets such as Onchidoris bilamellata which eats barnacles.