. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 172 L. M. Pessöa et al. The similarity in bacular morphology between P. yonenagae and these forms of P. iheringi is due to the presence of a dorsoventral curvature, the proximal end square or evenly round, and a lateral indentation in the shaft. The baculum of P. yonenagae is quite distinct in morphology from that of P. albispinus, whose bacular morph- ology is the most divergent amongst taxa in the subgenus Trinomys (fig. 1). The distinctiveness of bacular morpholo
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 172 L. M. Pessöa et al. The similarity in bacular morphology between P. yonenagae and these forms of P. iheringi is due to the presence of a dorsoventral curvature, the proximal end square or evenly round, and a lateral indentation in the shaft. The baculum of P. yonenagae is quite distinct in morphology from that of P. albispinus, whose bacular morph- ology is the most divergent amongst taxa in the subgenus Trinomys (fig. 1). The distinctiveness of bacular morphology in P. albispinus is due to the presence of well- developed apical wings with a pronounced median depression and a paddle-shaped proximal end (fig. 1; Pessöa & Reis 1992a). The qualitative analysis of bacular morphology indicates that, as evidenced by the overall shape of the baculum, P. yonenagae has affinities with taxa in the P. iheringi complex and not with P. albi- spinus as suggested by Rocha (1995). We proceed now with a quantitative analysis of cranial affinities of these taxa. The simple question is whether P yonenagae is craniometrically more similar to P albispinus or to taxa in the P iheringi complex. Figure 2 shows results obtained from 1,000 replications of the parametric bootstrap. Centroids for each taxon are indicated by a dot and the estimated bounds of craniometric variability are represented by ellipses derived from the parametric bootstrap. The confidence region for P yonenagae overlaps completely with those of P. iheringi along the first canonical variate. On the other hand, P yonenagae and P iheringi ellipses are completely separated from P. albispinus along this axis, which alone accounts for more than half ( °7o) of the variation in the seven canonical variates. This result suggests that P. yonenagae is craniometrically more similar to taxa in the P iheringi complex than to P. albispinus. The inference of expected craniometric variability
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