The family Gliridae contains 28 species in 9 genera. It can be divided into 3 subfamilies: Graphiurinae (Graphiurus); Leithiinae (Chaetocauda, Dryomys, Eliomys, Muscardinus, Myomimus, and Selevinia); and Glirinae (Glirulus and Glis) (Wilson and Reeder 2005).
The family Gliridae is smaller than it was in the past. More than 30 glirid genera have become extinct since the Eocene (Daams and De Bruijn 1995). (Daams and De Bruijn, 1995; Wilson and Reeder, 2005)