Microdyromys legidensis, García-Paredes & Peláez-Campomanes & Álvarez-Sierra, 2009

García-Paredes, Israel, Peláez-Campomanes, Pablo & Álvarez-Sierra, M. Ángeles, 2009, Gliridae (Rodentia, Mammalia) with a simple dental pattern: a new genus and new species from the European Early and Middle Miocene, Zoological Journal of the Linnean Society 157 (3), pp. 622-652 : 626-627

Simplomys aljaphi Pseudodryomys granatensis Armantomys tricristatus

Armantomys jasperi Simplomys julii Peridyromys murinus Microdyromys koenigswaldi Simplomys meulenorum Peridyromys darocensis + Microdyromys legidensis sp. nov. Prodryomys satus Glirudinus modestus

1978, Pseudodryomys rex (García-Moreno, 1986 in Álvarez Sierra & García-Moreno, 1986), and Pseudodryomys granatensis Agustí, 1993 in Martín-Suárez et al., 1993, are placed with Ps. ibericus in the more complex group ( Daams & de Bruijn, 1995; Daams, 1999). Pseudodryomys robustus De Bruijn, 1967 ; Pseudodryomys julii Daams, 1989 and Ps. simplicidens are included in the simple dental pattern group ( Daams & de Bruijn, 1995; Daams, 1999). The latter group was recognized on the basis of its particular dental morphology. Pseudodryomys simplicidens and Ps. robustus were considered as morphologically identical species ( De Bruijn, 1967; Daams, 1974) that differ only in size, Ps. simplicidens being smaller than Ps. robustus . This led to the use of the term ‘simplicidens – robustus’ or the term Total number of specimens in Aragonian type area (Calatayud–Montalbán Basin) = 461. Left columns include Mammal Neogene Zones (MN), local zones and numerical ages (in My) after Daams et al., 1999, as well as abbreviations for localities and institutions where collections are stored (see Material and Methods). Type locality in bold.

‘simplicidens–group’ that also included Ps. julii after 1989 (e.g. Daams & Freudenthal, 1981, 1988; Cuenca et al., 1983; Daams & van der Meulen, 1984; Sesé, López-Martínez & Herráez, 1985; Daams, Freudenthal & Álvarez Sierra, 1987; Van der Meulen & Daams, 1992; Daams et al., 1997; Daams et al., 1998). Thus, the group was treated as a supraspecific entity.

Álvarez Sierra et al. (1991) raised the question as to whether or not Ps. simplicidens and Ps. robustus should be included in the genus Pseudodryomys . A discussion on that subject was not included, because it was beyond the scope of their paper (for comments about the correct date of publication of various species described in Álvarez Sierra et al., 1991, see García- Paredes & van den Hoek Ostende, 2007). No further mention has been made about the option to exclude the species with a simple dental pattern from Pseudodryomys until the unpublished work of García- Paredes (2006), in which the designation of a new genus to include them was proposed.

In this paper we formally propose the new genus Simplomys gen. nov. to include all the species that show a highly simplified dental morphology and/or with a reduction in the size proportions of the upper and lower premolars and third molars relative to the first and second molars, as will be discussed below, that were previously included in the genus Pseudodryomys .

ORDER RODENTIA BOWDICH, 1821

FAMILY GLIRIDAE MUIRHEAD, 1819