Figure 6.Morphometric separation (first three principal components of a Principal Components Analysis) of 12 cranial and dental measurements. Data are from 70 adult skulls of Glauconycteris, Niumbaha, and Scotophilus (with measurements following Table 1 and 2). Specimens of Scotophilus, included for ecomorphological comparison, are indicated in red (open red squares, Scotophilus leucogaster; open red circles, Scotophilus viridis). Specimens of Glauconycteris are indicated in blue (open blue diamonds, Glauconycteris alboguttata; open blue triangles, Glauconycteris argentata; open blue circles, Glauconycteris beatrix, closed blue circles, Glauconycteris curryae; closed blue squares, Glauconycteris humeralis; closed blue diamonds, Glauconycteris poensis; closed blue triangles, Glauconycteris variegata). Specimens of Niumbaha superba from central Africa (DRC, S Sudan) are marked with crosses; specimens of Niumbaha superba from west Africa (Cote D’Ivoire, Ghana) are marked with asterisks. A Skulls of Niumbaha separate from skulls of species of Glauconycteris in combination along the first and second components, suggesting greater overall ecomorphological resemblance of Niumbaha with medium-sized, less specialized African vespertilionids such as Scotophilus. The first principal component reflects distinctions in overall skull size, which increases from right to left. B Separation of skulls of Niumbaha from those of Glauconycteris and Scotophilus in combination along the second and third components indicates the morphological isolation of Niumbaha and illustrates consistent differences in skull shape, reflecting (in separation along the third component) the proportionally narrower interorbital dimensions, less dramatic postorbital constriction, longer toothrows, narrowed skull, but widened anterior rostrum in Niumbaha relative to Glauconycteris.