During the time I was searching for Hawaiian slugs, I did not recognize the differences between this species and D. carbunculosa. Consequently, I do not have good data for where these were found and how common they are. An easy way to differentiate the two is to look at the bottom of the animal. D. tuberculosa has large spots scattered over the underside. The particular specimen below was photographed exposed on the reef at a depth of about 1.5m along the Magic Island channel on 2 June 1978. Marshall Islands specimens of this species are highly variable in color.
Created 20 April 2009