Amphipod crustacean eating bryozoa. Close-up of Acanthonotozoma inflatum (red) an amphipod found mainly in the North-West Atlantic ocean eating a bryozoa colony. Amphipods are small crustaceans that typically have a laterally flattened body and fourteen limbs. They form part of the zooplankton. Bryozoa are colonial animals that filter particles of food from the water with tiny tentacles.