MATERIAL

Our material consisted of lower and upper M1 and M2 of over 60 species of Gliridae, as specified in Table 1. Most of the material is from the collections of the National Museum of Natural History, Leiden (Netherlands), and from the collections we are currently studying that will be deposited in the museum of the Earth Sciences Department of the University of Zaragoza (Spain). A very important contribution to our material was the 'collection Mein' in Lyon (France). In a few cases we used published or unpublished figures, made by other people.

Table 1 lists the species analyzed in this paper using a taxonomy based on the classification by Daams and de Bruijn (1995). We made some modifications to the taxonomy as follows: (1) Glamyinae are separated from the Gliravinae, as proposed by Vianey-Liaud (1994); (2) the Bransatoglirinae are divided into three groups, as proposed by Freudenthal and Martín-Suárez (in press), with the early Oligocene species attributed to Oligodyromys, the large species from the late Oligocene and Miocene attributed to Bransatoglis or Paraglis, and a third group formed by Microdyromys; and (4) Stertomys is placed in the Myomiminae, as proposed by Freudenthal and Martín-Suárez (2006).

The catalogue numbers of the specimens, as far as available, are listed in Table 2. Catalogue numbers with the code RGM belong to the National Museum of Natural History, Leiden (the Netherlands). The majority of the other catalogue numbers is based on one of the locality codes listed in Table 3. These specimens will be deposited in the Earth Sciences Department of the University of Zaragoza (Spain). 'Coll. Mein' refers to unnumbered specimens in the Mein collection, in many cases casts of original material.

Published figures were taken from: Bahlo (1975), O. planus from Heimersheim; Hugueney (1969), P. fugax from Coderet; Vianey-Liaud (2004), G. antiquus from Itardies.