What is Flatfish?
{{Taxobox | name = Flatfish | image = Flatfish.jpg | image_width = 250px | image_caption = A camouflaged flatfish. | regnum = [[Animal]]ia | phylum = [[Chordate|Chordata]] | classis = [[Actinopterygii]] | infraclassis = [[Teleostei]] | ordo = '''Pleuronectiformes''' | subdivision_ranks = Families | subdivision = '''Suborder Psettodoidei''' <br> &nbsp;&nbsp;&nbsp; [[Psettodoidae]]<br> '''Suborder Pleuronectoidei'''<br> &nbsp;&nbsp;&nbsp; [[Citharidae]] (spiny [[turbot]]s)<br> &nbsp;&nbsp;&nbsp; [[Scophthalmidae]] [[turbot]]s<br> &nbsp;&nbsp;&nbsp; [[Bothidae]] (lefteye [[flounder]]s)<br> &nbsp;&nbsp;&nbsp; [[Pleuronectidae]] (righteye [[flounder]]s)<br> &nbsp;&nbsp;&nbsp; [[Paralichthyidae]]<br> &nbsp;&nbsp;&nbsp; [[Achiropsettidae]] (southern flounders)<br> &nbsp;&nbsp;&nbsp; [[Samaridae]]<br> '''Suborder Soleoidei'''<br> &nbsp;&nbsp;&nbsp; [[Soleidae]] ([[sole]]s)<br> &nbsp;&nbsp;&nbsp; [[Achiridae]] (American soles)<br> &nbsp;&nbsp;&nbsp; [[Cynoglossidae]] (tonguefish) }} A '''flatfish''' is a type of [[fish]] which is a member of the order '''Pleuronectiformes'''. There are several different kinds of flatfish. Some of them are fished commercially, like [[flounder]], [[sole]], [[turbot]], [[plaice]], and [[halibut]]. They are part of the [[Percomorpha]]. All flatfish are rather flat, and are ray-finned fish. During their evolution, their eyes have moved so that they are on the same side, which the fish keeps uppermost. They swim like this, and can hide in the sand waiting for [[prey]] on the [[ocean floor]]. They have a capacity for dynamic [[camouflage]], which is under nervous control, and can change in 'real time' to match their background. It is a group of fish which are all [[adapted]] to the same habitat. They share those features which suit their life-style. They have both eyes on one side of the head: the upper side. This is their main adaptation to living on the [[seabed]] ([[benthos]]). Other distinguishing (different from others) features are the protrusible eyes: they can stick the eyes up a bit