Nitrosococcus

{{Short description|Genus of bacteria}}

{{Italic title}}

{{Taxobox

| name = Nitrosococcus

| domain = Bacteria

| phylum = Pseudomonadota

| classis = Gammaproteobacteria

| ordo = Chromatiales

| familia = Chromatiaceae{{cite journal |vauthors=Campbell MA, Chain PS, Dang H, El Sheikh AF, Norton JM, Ward NL, Ward BB, Klotz MG | title = Nitrosococcus watsonii sp. nov., a new species of marine obligate ammonia-oxidizing bacteria that is not omnipresent in the world's oceans: Calls to validate the names 'Nitrosococcus halophilus' and 'Nitrosomonas mobilis'. | journal = FEMS Microbiol Ecol | year = 2011 | volume = 76 | issue = 1 | pages = 39–48| doi = 10.1111/j.1574-6941.2010.01027.x | pmid = 21204874 | bibcode = 2011FEMME..76...39C }}

| genus = Nitrosococcus

| genus_authority = Winogradsky 1892 (Approved Lists 1980)

| type_species = Nitrosococcus nitrosus

| type_species_authority = (Migula 1900) Buchanan 1925 (Approved Lists 1980)

| subdivision_ranks = Species{{cite web|vauthors=Euzéby JP, Parte AC |url=https://lpsn.dsmz.de/genus/nitrosococcus |title=Nitrosococcus |access-date=May 22, 2021 |publisher=List of Prokaryotic names with Standing in Nomenclature (LPSN)}}

| subdivision =

• "Nitrosococcus halophilus" Campbell et al. 2011
• "Nitrosococcus mobilis" Koops et al. 1976
• Nitrosococcus nitrosus (Migula 1900) Buchanan 1925 (Approved Lists 1980)
• Nitrosococcus oceani corrig. (Watson 1965) Watson 1971 (Approved Lists 1980)

• "Nitrosococcus wardiae" Wang et al. 2016{{cite journal |vauthors=Wang L, Lim CK, Dang H, Hanson TE, Klotz MG | title = D1FHS, the Type Strain of the Ammonia-Oxidizing Bacterium Nitrosococcus wardiae spec. nov.: Enrichment, Isolation, Phylogenetic, and Growth Physiological Characterization | journal = Front Microbiol | year = 2016 | volume = 7 | pages = 512| doi = 10.3389/fmicb.2016.00512 | pmid = 27148201 | pmc = 4830845 | doi-access = free }}
• "Nitrosococcus watsonii" Campbell et al. 2011

| synonyms =

• "Nitrosocystis Watson 1965

}}

Nitrosococcus is a genus of Gram-negative bacteria.George M. Garrity: Bergey's Manual of Systematic Bacteriology. 2. Auflage. Springer, New York, 2005, Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria It is an ammonia-oxidizing bacterium which oxidizes ammonia into nitrite. Nitrosococcus can be found in marine environments and salt lakes.