Aquicella is a genus of Gram-negative rod-shaped cells and filaments in the family Coxiellaceae from the order Legionellales. The type species of this genus is Aquicella lusitana.

The name Aquicella is composed of the Latin term aqua (referring to water) and the Latin term cella (referring to a chamber, closet, or cabinet, or in biology, a cell). Together, the name Aquicella translates to a cell from water.

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