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the authors classified most specimens of Thespesius annectens in the new genus Anatosaurus, and referred Cope's giant "duck-billed" specimens to Anatosaurus copei. Though they noted that T. occidentalis could possibly be distinguished from Anatosaurus based on its shorter tail vertebrae, they ultimately agreed with Lambe that, despite its historical importance, Thespesius occidentalis was too incomplete for good comparison. It has been generally ignored as a nomen dubium ever

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