Figure 2 in Species limits within the Praomys delectorum group (Rodentia: Muridae: Murinae) of East Africa: a morphometric reassessment and biogeographical implications

Figure 2. Two scatter plots depicting results of principal component analysis of 18 log-transformed craniodental variables as measured on 157 intact specimens representing samples of delectorum (OTUs 20, 21) and melanotus (OTUs 16–19). The factor scores of the type specimens of delectorum and melanotus are indicated by small crosses; see Table 2 for variable correlations and variance explained. A, projection of unrotated specimen scores onto the first and second principal components (PC) extracted; major axes of the species constellations and regression statistics are indicated (see text for discussion). Individuals from the Misuku Mts (OTU 19), northern Malawi, which systematists have inconsistently treated as geographical representatives of delectorum or melanotus, are interspersed among examples of the latter species. B, projection of specimen scores, after varimax rotation, onto the first and second principal components (PC) extracted. Reorientation of major axes of the species constellations maximizes age variation along PC I, whereas taxon differences are consolidated mostly along PC II (see text for discussion).