in the 2004 review by Jack Horner and colleagues. They reported its type material as lost, although they also reported the remains as only including a single toe bone, instead of the three toe bones described by Gregory.

Reports of gastroliths, or stomach stones, in Claosaurus are actually based on a probable double misidentification. The specimen thought to have gastroliths is actually of Edmontosaurus annectens. Barnum Brown, who discovered the specimen in 1900,