. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 256 V. T. Volobouev, M. Tränier & D. Dutrillaux. Fig. 2: Right upper molar row (Ml) of Acomys, scale 10 mm. A. A. cahirinus paratype; B. A. cf. dimidiatus Israel; C. A. cf. dimidiatus Israel breed; D. A. cf. dimidiatus Taif, Arabia; E. A. airensis Agades, Niger; F. A. airensis Agades breed. are clearly different (dimensions and prelobe, Fig. 2). Acomys from Taif whose karyotype is presented here draws nearer to the form from Israel. Finally, A. airensis is very
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 256 V. T. Volobouev, M. Tränier & D. Dutrillaux. Fig. 2: Right upper molar row (Ml) of Acomys, scale 10 mm. A. A. cahirinus paratype; B. A. cf. dimidiatus Israel; C. A. cf. dimidiatus Israel breed; D. A. cf. dimidiatus Taif, Arabia; E. A. airensis Agades, Niger; F. A. airensis Agades breed. are clearly different (dimensions and prelobe, Fig. 2). Acomys from Taif whose karyotype is presented here draws nearer to the form from Israel. Finally, A. airensis is very different from Asian Acomys studied and presented here: the molars are small and narrow, and the outline of the prelobe is less angled (Fig. 2). The karyotype of Acomys cf. dimidiatus comprises 38 chromosomes with 16 pairs of meta- and submetacentric, 2 pairs of acrocentric and two acrocentric X chromo- somes (Fig. 3). The N. F. is equal to 70. C-banding exhibits small blocks of hetero- chromatin on about half of chromosomes, including X chromosomes, which display heteromorphism (Fig. 4). Among the species of the genus Acomys karyologically studied previously, only one specimen of Acomys airensis was studied with banding techniques (Viegas-Pé- quignot et al. 1983). This species had a diploid number 2n = 42 and N. F. = 68. Comparative analysis of the banding pattern in these two species reveals homology between all but three chromosome arms or acrocentric chromosomes (Table 2). As can be reconstructed from Table 2 data, all acrocentric chromosomes in the 2 species were fused in different combinations so that there are no identical biarmed chromo- somes in their karyotypes. Thus, the difference of the karyotypes is due not only to different numbers of Robertsonian translocations but above all to different combina- tions of fusions. It was mentioned above that 3 chromosome arms in A. cf. dimidiatus, namely llq, 14p and 15q, have no homologous chromosomes in^. airen- sis. The na
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