Several models have been proposed to explain high macrofaunal diversity in the deep-sea benthos, but a mechanistic explanation of the maintenance of the enhanced diversity has not been demonstrated. This paper seeks evidence in meiofaunal harpacticoid copepod species' dispersion patterns of evidence of spatial scales at which diversity-maintaining processes act. Evidence of nonrandom dispersion is found at "100 meter," "meter" and "centimeter" scales of sample separation....