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Which side of a flatfish is called the blind side?
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pleuronectiform
Body plan and sexual dimorphism in the common sole (Solea solea) and dusky flounder (Syacium papillosum).
In the order Pleuronectiformes, the blind side refers to the lower, unpigmented side of the fish that rests against the bottom.12
While larval flatfishes are bilaterally symmetrical, they undergo a metamorphosis during which one eye migrates to the other side of the head. The side that remains against the substrate is the blind side, which is typically white and lacks the pigmentation found on the upper, ocular side.132