. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 182 Bonner zoologische Beiträge 53 (2004). Fig. 6: Border lines of greater (bold) and lesser (dotted) importance for colouration changes in Anomalurops beecrofti, Anomalu- rus derbianus and A. pelii (see text for details). A. beecrofti this river system forms a significant barrier for ventral colouration, but only the Ubangi part signifi- cantly separates neighbouring populations in dorsal colouration. Results for the area between the Congo River and the Ubangi, Uel
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 182 Bonner zoologische Beiträge 53 (2004). Fig. 6: Border lines of greater (bold) and lesser (dotted) importance for colouration changes in Anomalurops beecrofti, Anomalu- rus derbianus and A. pelii (see text for details). A. beecrofti this river system forms a significant barrier for ventral colouration, but only the Ubangi part signifi- cantly separates neighbouring populations in dorsal colouration. Results for the area between the Congo River and the Ubangi, Uelle, and Kibali river system are also contra- dictory. For A. beecrofti, a significant boundary in dor- sal colouration frequencies between the northwestern and southeastern part of the range (Fig. 6, line 13) cor- responds to the Aruwimi and Ituri river system, but is not matched by the ventral colouration. Dorsal and shoulder colouration of A. derbianus are uniform in this area, but there are differences in ear colouration be- tween specimens from the northwest and souteast (Fig. 6, line 12). However, this boundary lies further west than in A. beecrofti. The north bow of the Congo River (Fig. 6, line 11) seems to have no effect on the dorsal, ear and shoulder colouration frequencies in A. derbi- anus. The same applies to the northwestern population of A. beecrofti, while southeastern specimens are sig- nificantly different from those south of the Congo (Fig. 6, line 14). Specimens of A. beecrofti from W-Angola seem to be different from individuals caught in the Congo Basin (Fig. 6, line 15), but the sample size is small. For A. derbianus the situation is more complex, because this species occurs also in E-Angola, Zambia, and Tanzania (Fig. 6, line 16). There are only slight dif- ferences between specimens from the Congo basin and W-Angola. Light epaulettes are missing in all specimens from Angola, S-Democratic Republic of Congo, Zambia and Tanzania. In the same area (except
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