. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 228 J. Ventura &J. Gosálbez. Fig. 1: Geographical distribution of Arvícola terrestris in the Iberian Peninsula. (O): absence of the species; (A): probable presence. stein, 1963; Spitz & Morel, 1972; Le Louarn & Saint-Girons, 1977; Baudoin, 1984); although according to different authors (Spitz & Morel, 1972; Morel, 1981) the subspecies exitus has at present lost its taxonomic identity when reaching a synonymy with A. t. scherman. With the aim of placi
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 228 J. Ventura &J. Gosálbez. Fig. 1: Geographical distribution of Arvícola terrestris in the Iberian Peninsula. (O): absence of the species; (A): probable presence. stein, 1963; Spitz & Morel, 1972; Le Louarn & Saint-Girons, 1977; Baudoin, 1984); although according to different authors (Spitz & Morel, 1972; Morel, 1981) the subspecies exitus has at present lost its taxonomic identity when reaching a synonymy with A. t. scherman. With the aim of placing these populations geopgraphically in an accurate way, as well as avoiding possible taxonomic mistakes with respect to other northern populations, in the present study it has been chosen to keep the classical subspecific denomination of A. t. exitus. The systematic and taxonomy of the Iberian populations still present many features that must be clarified; specially, if the last published data about the distribu- tion of A. terrestris in the Iberian Peninsula are taken into account. This study aims to carry out a biometric characterization of the Iberian populations of this species coming from the Cantabrian range of mountains and the Catalonian Pyrenees and evaluates, comparing the different groups, the homogeneity A. terrestris has in this territory. Likewise, the degree of relationship between each one of these populations and those dwelling in the Alps and the Massif Central has been evaluted. Material and methods This study is based on the biometric and morphological comparison of the following samples of A. terrestris: 32 specimens (14 cr and 18 9) from Ally (Cantal, Massif Central, France) we were donated by Dr. E. L. Petavy (Université Claude Bernard, Lyon, France); 40 specimens (18 cr and 22 9) from Switzerland (Bassins and Interlaken) and Liechtenstein (Vaduz and Schaan) proceeding from the Alexander Koenig Museum collection (Bonn, Western Ger- many); 82 specimen
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