Clethrionomys Tilesius, 1850 is the valid generic name for red-backed voles and Myodes Pallas, 1811 is a junior synonym of Lemmus Link, 1795

Red-backed voles are widespread animals in the temperate zone of the Northern Hemisphere, and have considerable economic, medical, and scientific importance; the name Clethrionomys Tilesius, 1850 has been overwhelmingly used for red-backed voles in the extensive literature of the 20 th and early 21 st centuries. An analysis of 19 th century zoological literature shows widespread usage of Myodes as the generic name for Norway and Siberian lemmings (currently genus Lemmus Link, 1795). In accordance with that understanding, Coues (1877) gave a diagnosis of Myodes explicitly based on Mus lemmus, which constitutes a valid nomenclatural act designating the type species of the genus Myodes. According to Article 69.1 of the ICZN, all subsequent designations of type species (e.g. that of Lataste, 1883) are not valid. Therefore, Clethrionomys remains the valid genus name for red-backed voles and Myodes is a junior synonym of Lemmus. The incorrect usage of Myodes instead of Clethrionomys for red-backed voles has led to scientific and practical instability and confusion, and should be discontinued.