:Methylosphaera hansonii

{{Short description|Species of bacterium}}

{{speciesbox

|genus=Methylosphaera

|species=hansonii

|authority=J.P.Bowman et al. 1997

}}

Methylosphaera hansonii, also called Antarctic budding methanotroph AM6,{{cite web|author1=|title=Methylosphaera hansonii|url=https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=51353|website=NCBI taxonomy|publisher=National Center for Biotechnology Information|access-date=19 December 2017|location=Bethesda, MD|language=English|quote=Other names: synonym: Antarctic budding methanotroph AM6}} is a species of psychrophilic, group I methanotrophs, named after microbiologist Richard S. Hanson.{{cite journal|last1=Bowman|first1=John P.|last2=McCammon|first2=S. A.|last3=Skerrat|first3=J. H.|title=Methylosphaera hansonii gen. nov., sp. nov., a psychrophilic, group I methanotroph from Antarctic marine-salinity, meromictic lakes|journal=Microbiology|volume=143|issue=4|date=1997|pages=1451–1459|issn=1350-0872|doi=10.1099/00221287-143-4-1451|pmid=9141708|doi-access=free}} It is non-motile, coccoidal in morphology, does not form resting cells, reproduces by constriction, and requires seawater for growth. Its type strain is ACAM 549.

The cells are round and 1.5–2.0 μm in diameter. They are Gram-negative, non-motile, and strictly aerobic. They use methane and methanol as substrates to produce energy, and they can fix atmospheric nitrogen.{{cite book|editor1=David R. Boone|editor2=Richard W. Castenholz|title=Bergey's Manual of Systematic Bacteriology|url=https://books.google.com/books?id=3znhBwAAQBAJ&q=%22genus+methanothermococcus%22&pg=PA242|volume=2|publisher=Springer Science & Business Media|pages=242|date=2007-12-14|access-date=2016-09-10|isbn=978-0387280226}}