Aquaspirillum

Aquaspirillum
Scientific classification
Kingdom:	Bacteria
Phylum:	Proteobacteria
Class:	Beta Proteobacteria
Order:	Neisseriales
Family:	Neisseriaceae
Genus:	Aquaspirillum

Aquaspirillum (ak'wă-spī-ril'ŭm) is a genus of aerobic bacteria in the family Neisseriaceae that lives in freshwater.

The species have cells that are 0.2–1.5 mcm in diameter. Their motile cells have a fascicle of flagella on one or both ends, with the exception of one species. They are rigid and generally helical, and are 0.2–1.4 um in diameter. They also have a special polar membrane near the flagella.

Growth is optimal in 30–32° Celsius.

The following are species of Aquaspirillum.

A phylogenetic analysis by NCBI showed data that suggested all species of Aquaspirillum, besides the type species, should be moved into their own respective genera as Aquaspirillum is phylogenetically heterogeneous. However, no new genus for the misclassified species has been proposed, so they technically remain in Aquaspirillum.

...
Wikipedia