A reevaluation of the Pennsylvanian nuculoid pelecypod genus Anthraconeilo Girty (1911) reveals that it is a junior synonym of Palaeoneilo Hall and Whitfield, 1869. Girty's type species, A. taffiana, Yoldia carbonaria Meek, and Y. knoxensis McChesney are all considered to be synonyms of Y.? oweni McChesney. Two species referred to Anthraconeilo by Morningstar (1922) are also discussed, although material suitable for an adequate reappraisal is wanting. The genus Palaeoneilo, not previously considered to be a typical representative of Pennsylvanian pelecypod biota, is found to be common in the marine zones of the Pennsylvanian System.

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