These long-legged, dark-colored water spiders are distinctive in that the oval abdomen is smaller than the broad cephalothorax. The rim stripe surrounding the dark carapace, and sometimes the abdomen, is whitish-yellow. On top of the dark brown abdomen, three distinctive pairs of minute white spots create a connect-the-dot pyramid or run mid-line down the back. The brown legs are robust and dotted with white hairs.