Flatfish Flatfish A flatfish is a member of the order Pleuronectiformes of ray-finned demersal fishes, also called the Heterosomata, sometimes classified as a suborder of Perciformes. In many species, both eyes lie on one side of the head, one or the other migrating through or around the head during development. Some species face their left sides upward, some face their right sides upward, and others face either side upward. Many important food fish are in this order, including the flounders, soles, turbot, plaice, and halibut. Some flatfish can camouflage themselves on the ocean floor. Over 700 species are in the 11
Eclecta aurorella by a slender white line. There is an irregularly triangular dark reddish-fuscous blotch, more ochreous-fuscous beneath, on the hindmargin, its apex extending to the disc at three-fifths from the base, its base extending from above the anal angle to beneath the apex, the lower side suffused, upper side connected in the disc with a dark reddish-fuscous acute diamond-shaped mark beneath the costa, beyond the connection margined with white. Within this triangle is a slender white twice sharply-toothed line proceeding from the middle of the upper side to the lower angle, and two small indistinct whitish spots on the hindmargin. The