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Arthropods, 2019, 8(3): 102-109
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Article

Size dimorphism and directional selection in forest millipedes

Mark Cooper
School of Animal, Plant and Environmental Sciences University of the Witwatersrand, Johannesburg 2050, South Africa

Received 23 January 2019;Accepted 5 March 2019;Published 1 September 2019
IAEES

Abstract
Sexual Size Dimorphism (SSD) in the diplopod genus Centrobolus has a positive correlation with body size. Length, width and rings are the main components of interspecific variation in diplopod species. Interspecific variation in size was calculated in 6 species and data sets tested for normality. All data observed and tested were normal. Intersexual variation (coefficients of variation) in length and width was compared in 9 species using MEDCALC. In C. digrammus, C. inscriptus, and C. silvanus there was significant directional selection for slender males.

Keywords diplopoda;horizontal;length;normal;tergite;width.

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