Meniscoessus is a genus of extinct mammal from the Upper Cretaceous Period of North America. It was one of the little furry creatures living among the dinosaurs and was a member of the extinct order Multituberculata. The multituberculates had a cranial and dental anatomy superficially similar to rodents such as mice and rats, with cheek-teeth separated from the chisel-like front teeth by a wide tooth-less gap. Each cheek-tooth displayed several rows of small cusps (or tubercles, hence the name) that operated against similar rows in the teeth of the jaw. However, unlike rodents which have ever-growing teeth, multituberculates still underwent through dental replacement patterns typical to most mammals (though in at least some species the lower incisors continued to erupt long after the root's closure These were small rodent looking mammals that existed for approximately 166 million years, the longest fossil history of any mammal lineage. Several species ranged in weight from 1.4 to 3.5 kilograms (3 to 7.5 pounds.
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