Chanet, B. 2003. Interrelationships of scophthalmid fishes (Pleuronectiformes: Scophthalmidae). Cybium 27: 275-286.
In the Catalog of Fishes, Scophthalmus maximus is considered as a synonym of Psetta maxima.
But Chanet told me that Suzuki et al. and Nielsen come to an agreement that Psetta isn't valid and that Scophthalmus must be used as the valid name.
So, which is the valid name?...