Aquaspirillum
''Aquaspirillum'' (ak'wă-spī-ril'ŭm) is a genus of helical aerobic bacteria in the family ''Neisseriaceae'' that lives in freshwater. Taxonomy 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. The genus ''Aquaspirillum'' was not created until 1973, when another review of ''Spirillum'' led to the division of the genus into ''Aquaspirillum'', ''Oceanospirillum'', and ''Spirillum''. Etymology The genus' name is a combination of several words. ''Aqua'' comes from Latin, meaning water; ''speîra'' comes from Greek, meaning a spiral; ''spirillum'' come from Neo-Latin, meaning a small spiral. Put together, the genus' name means "small water spiral." Species The new genus comprised the following 13 species when it was created: *'' Aquaspirillum anulus'' *'' Aquaspirillum aquaticum'' * ''Aquaspirill ...
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