 Some of the skulls discovered in this region were said to be incorrectly assigned to "Nicrosaurus" instead of "Rutiodon".The first phytosaur taxon discovered in North America was believed to be from a skull of "Belodon buceros" in 1881 in the Chama basin, of north-central New Mexico.The species has also been attributed to other genera, including "Pseudopalatus", "Phytosaurus", "Machaeroprosopus", "Arribasuchus" and "Nicrosaurus."