Paralichthys is a genus of large-tooth flounders. Most species are native to the coastal waters of the Americas, but P. olivaceus is from northeast Asia. The largest species reaches about 1.5 m (5 ft) in length. There are currently almost 20 species in this genus: The American four-spot flounder Hippoglossina oblonga is sometimes placed placed in Paralichthys by some authorities but FishBase does not and that source is followed here.