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Arthropods, 2018, 7(4): 82-86
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Article

Centrobolus lawrencei (Schubart, 1966) monomorphism

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

Received 10 August 2018;Accepted 10 September 2018;Published 1 December 2018
IAEES

Abstract
The present research aimed to study relative sexual size dimorphism of Centrobolus lawrencei compared to congenerics. Millipedes illustrated reversed sexual size dimorphism (SSD) as females were larger than males and broke the rule as this dimorphism increased with body size. SSD was calculated in 21 species of the genus Centrobolus and illustrated as a regression. The approximate relative position of C. lawrencei was shown from measurements taken in South Africa. The average size of C. lawrencei was 47.3333 * 4.82222 mm (n=9) and logged (x/y = 2.36132). Males were 47.875 * 4.6875 mm (n=8) and females 43 * 5.9 mm (n=1). The SSD index was 1.00201. Log volume measurements were (females/x = 2.36553 mm³; males/y = 2.36079 mm³). The difference between the correlation coefficients for the species and the genus were not highly significant (ra = 0.867365, rb = 0.7473; na = 9, nb = 21; Z = 0.75; P (one-tailed) = 0.2266, P (two-tailed) = 0.4533). The mean volume ratio for C. lawrencei was 1.00201 which did not differ from 1 (t=1.82574; p-value=0.097855; NS at p<0.01; n=8).

Keywords Centrobolus;dimorphism;lawrencei;millipede;SSD;size.

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