Millipede Taxonomy after 250 Years: Classification and Taxonomic Practices in a Mega-Diverse yet Understudied Arthropod Group
Figure 3
Number of millipede species descriptions in countries as a correlate of land area and human population.
Plots A, C, and E show all countries from which millipedes have been described. Plots B, D, and F have the countries designated as tropical (≥50% of total land area in the tropics) or nontropical (<50% of total land area in the tropics) and were analyzed separately. The outliers for human population, India and China, are excluded from plots E and F.