Anatotitan
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Anatotitan Chapman & Brett-Surman, 1990 is a hadrosaurid dinosaur genus, consisting of two species. The genus was erected for species belonging to the historical genus Anatosaurus that differ enough from Edmontosaurus. The type species is Anatotitan copei (Lull & Wright, 1942) (originally Anatosaurus copei). The other species is A. longiceps (Marsh, 1890) [nomen dubium] (originally Anatosaurus longiceps).