Figure 4 in Discovering endemic species among the bumblebees of Taiwan (Apidae, genus Bombus)

Figure 4. Map of species richness for the bumblebee species endemic to Taiwan and their closest relatives on the mainland (from Table 3) among equal-area grid cells. Numbers of species are written in black. The grid is based on longitudinal intervals of 10°, which are used to calculate graduated latitudinal intervals to provide equal-area cells (each cell has an area of approximately 611,000 km2). The colour scale (right) has equal-frequency richness classes, with the maximum in a separate class. The map is a cylindrical orthomorphic equal-area projection (excluding Antarctica) with north at the top.