Flowery flounder, Bothus mancus,
Bahía de la Chiva, at Hawaii

A flounder blending into its environment

Flounders are a group of flatfish. The term is used for a number of flatfish who only related by being in the suborder Pleuronectoidei: (families Achiropsettidae, Bothidae, Pleuronectidae, Paralichthyidae, and Samaridae). It is a "form name", which means they are not necessarily close relations, they just look alike.