cynodont

British

/ ˈsaɪnəˌdɒnt /

noun

a carnivorous mammal-like reptile of the late Permian and Triassic periods, whose specialized teeth were well developed

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The study, titled "Biomechanics of the mandibular middle ear of the cynodont Thrinaxodon and the evolution of mammal hearing," was supported by UChicago, the National Institutes of Health, and the National Science Foundation.

From Science Daily

Guillermo Rougier, a palaeontologist at the University of Louisville in Kentucky, describes them as “incredible discoveries” that are right on the cusp between mammals and their cynodont ancestors.

From Nature

Yes, the first mammals developed from a reptile known as the cynodont.

From Project Gutenberg

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