eng International Academy of Ecology and Environmental Sciences Arthropods 2224-4255 2020-3-1 9 1 15 20 3 article Mark Cooper 1 2 School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg 2050, South Africa Correlates of diplopod size include diet, copulation duration, energy expense of copulation, oxygen consumption, precipitation, sex and temperature. Sexual Size Dimorphism (SSD) in the diplopod genus Centrobolus has a positive correlation with body size and copulation duration. Intraspecific variation in mass was calculated in forest millipedes and correlated with copulation duration (R^2=0.68, d.f.=7, p=0.01). Interspecific variation in mass was calculated in forest millipede species and correlated with copulation duration (R=0.6711, R^2=0.4504, p=0.144473, n= 3, 3). http://www.iaees.org/publications/journals/arthropods/articles/2020-9(1)/correlation-between-mass-and-copulation-duration-in-millipedes.pdf copulation Diplopoda horizontal lighter mass