Classification of the genus Haplocanthosaurus
G. †Haplocanthosaurus Hatcher 1903
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†Haplocanthosaurus delfsi McIntosh and Williams 1988
†Haplocanthosaurus priscus Hatcher 1903
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Invalid names: Haplocanthosaurus utterbacki Hatcher 1903 [synonym]
Invalid names: Haplocanthus Hatcher 1903 [synonym]