Lisserpeton bairdi, n. gen., n. sp., occurs in the Late Cretaceous Bug Creek local fauna of Montana. It is most closely related to the Late Cretaceous and Paleocene Scapherpeton tectum, and belongs with it in the family Scapherpetonidae. Lisserpeton is also present in the vertebrate fauna of the Lance Formation, Late Cretaceous, Wyoming, and in a number of Paleocene localities in Montana and Wyoming.
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Richard Estes (1965) studied this question.