Flatfish entire order was John Roxborough Norman's "Monograph of the Flatfishes" published in 1934. New species are described with some regularity and undescribed species likely remain. Hybrids are well known in flatfishes. The Pleuronectidae, of marine fishes, have the largest number of reported hybrids. Two of the most famous intergeneric hybrids are between the European plaice ("Pleuronectes platessa") and European flounder ("Platichthys flesus") in the Baltic Sea, and between the English sole ("Parophrys vetulus") and starry flounder ("Platichthys stellatus") in Puget Sound. The offspring of the latter species pair is popularly known as the hybrid sole and was initially believed to
Pacific sanddab Pacific sanddab The Pacific sanddab ("Citharichthys sordidus") is a species of flatfish. It is by far the most common sanddab, and it shares its habitat with the longfin sanddab ("C. xanthostigma") and the speckled sanddab ("C. stigmaeus"). It is a medium-sized flatfish, with a light brown color mottled brown or black, occasionally with white or orange spots. The Pacific sanddab is endemic to the northern Pacific Ocean, from the Sea of Japan to the coast of California. They are most commonly found at depths of , though the young inhabit shallower waters, occasionally moving into tide pools. It is an