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The recessus orbitalis is an accessory organ of flatfishes functioning in the protrusion of the eyes. This character, along with cranial asymmetry and a forward insertion of the dorsal fin, have been considered synapomorphies for the Pleuronectiformes. New dissections and examination of images taken in the wild show that the recessus orbitalis is present in all representatives of Pleuronectoidei examined...
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