Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Xanclomys is a small mammal from the Paleocene of North America. It was a genus within the extinct order Multituberculata within the suborder Cimolodonta and family Neoplagiaulacidae. The genus Xanclomys, named by Rigby J.K. in 1980, is also known as Xancolomys The identification is based on a single species, Xanclomys mcgrewi. Fossil remains were found in the Torrejonian (Paleocene)-age strata of the Swain Quarry in Wyoming (U.S.). Affinities are uncertain. There''s perhaps a second, unnamed species. Mammals (formally Mammalia) are a class of vertebrate, air-breathing animals whose females are characterized by the possession of mammary glands while both males and females are characterized by sweat glands, hair and/or fur, three middle ear bones used in hearing, and a neocortex region in the brain.