see text Microvirgula Paturaeu, 1998 Aquaspirillum /ˌakwəspəˈrɪləm/ is a genus of helical aerobic bacteria in the family Neisseriaceae that lives in freshwater.

In 1832, the genus Spirillum was created and encompassed an array of helical bacteria.

In 1957, the large genus was reviewed and narrowed to include 19 species based on morphology and a few other physiological characteristics.

[5] All Aquaspirillum species are rigid helical cells with the exception of A. delicatum and A. fasciculus.

[1][6] Most species of Aquaspirillum are aerobic, but some exist in areas with microaerophilic activity, performing certain amounts of nitrogen fixation.