Scalaridelphys (meaning "womb that resembles stairs"—in reference to the Grand Staircase–Escalante National Monument and the fact that it was related to extant marsupials) is an extinct genus of aquiladelphid pediomyoid mammal from the Late Cretaceous (Turonian)-aged Straight Cliffs Formation of Utah. Initially named as Scalaria in 2020, the genus name was changed to Scalaridelphys in 2021 when the authors were told by B. Creisler that the name Scalaria was already in use for a now-obsolete genus of gastropod named by Jean-Baptiste Lamarck in 1801.Lamarck, J.-B. (1801). Système des animaux sans vertèbres, ou tableau général des classes, des ordres et des genres de ces animaux; présentant leurs caractères essentiels et leur distribution, d'après la considération de leurs..., Paris, Detreville, VIII: 1–432. Two species of Scalaridelphys are known: the type species S. martini and S. aquilana.
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