''Knoellia'' is a genus of

Gram positive In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall. The Gram stain i ...

, aerobic, non-

endospore An endospore is a dormant, tough, and non-reproductive structure produced by some bacteria in the phylum Bacillota. The name "endospore" is suggestive of a spore or seed-like form (''endo'' means 'within'), but it is not a true spore (i.e., not ...

forming bacteria. Species in this genus are

mesophilic A mesophile is an organism that grows best in moderate temperature, neither too hot nor too cold, with an optimum growth range from . The optimum growth temperature for these organisms is 37 °C (about 99 °F). The term is mainly applied ...

and have cells that are irregular rods or

coccoid Coccoid means shaped like or resembling a coccus, that is, spherical.The noun coccoid or coccoids may refer to: * a level of organization, characterized by unicellular, non-flagellated, non-amoeboid organisms, with a definite shape, in general bu ...

. The genus was first proposed in 2002. The

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

''K. sinensis'' was first isolated from cave soil in

Guilin Guilin (Standard Zhuang: ''Gveilinz''), postal map romanization, formerly romanization of Chinese, romanized as Kweilin, is a prefecture-level city in the northeast of China's Guangxi, Guangxi Zhuang Autonomous Region. It is situated on the we ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

. The genus is named after

Hans Knöll Hans Knöll (January 7, 1913 – June 26, 1978) was a German physician and microbiologist. He was the director of the Central Institute of Microbiology and Experimental Therapy in Jena from 1953 to 1976, a member of the Academy of Sciences of ...

, a German physician and microbiologist, and a "pioneer in antibiotic research. Other members of this genus have been initially isolated from soil, air, and pig manure. '' K. remsis'' was originally classified in the genus '' Tetrasphaera'', but was reclassified into ''Knoellia'' in 2018. Species from this genus produce white or cream-colored colonies on R2A agar, expect for '' K. flava'', which produces yellow colonies. All species are

; optimum growth is between 28 and 35 °C and pH 5.0-9.0. ''K. remsis'' is the only species capable of growth above 42 °C.

References

{{Taxonbar, from=Q21218819 Bacteria genera Intrasporangiaceae