A genus of motile, nonsporeforming, aerobic bacteria (family Spirillaceae) containing Gram-negative, rigid, helical or helically curved cells which are 0.2 as the terminal electron acceptor. These organisms are chemoorganotrophic, possessing a strictly respiratory metabolism. They do not ferment carbohydrates; a few species can oxidize a limited variety of carbohydrates. The habitat of these organisms is fresh water. The type species is Aquaspirillum serpens.
[L. aqua, water, + spirillum, coil]