"Candidatus Nitrososphaera" Hatzenpichler et al. 2008
Nitrososphaera is a mesophilic genus of ammonia-oxidizing Crenarchaeota.[1][2] The first Nitrososphaera organism was discovered in garden soils at the University of Vienna leading to the categorization of a new genus, family, order and class of Archaea.[3] This genus is contains three distinct species: N. viennensis, Ca. N. gargensis, and Ca N. evergladensis.[1]Nitrososphaera are chemolithoautotrophs and have important biogeochemical roles as nitrifying organisms.[4]