''Intrasporangium'' 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 ...

, nonmotile bacteria. The genus name refers to the mycelium of the type strain forming intercalary vesicles that were originally identified as spores. However, no spores have been observed in later studies. The

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Intrasporangiaceae is named after the genus, and ''Intrasporangium'' is the

type genus In biological taxonomy, the type genus (''genus typica'') is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature, "The name-bearin ...

for the family. The genus was first proposed in 1967. 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 ...

''I. calvum'' was first isolated from air in a school dining room in the

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

. The genus was

monospecific In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

until 2012, when three species were added to the genus. ''I. chromatireducens'' and ''I. mesophilum'' were proposed as new species, and the monospecific ''Humihabitans oryzae'' was reclassified as ''I. oryzae''. The novel genus and species ''Monashia flava'' was proposed in 2016, but was later found to be a member of ''Intrasporagium'', most likely a strain of ''I. oryzae''. The genus is currently defunct. Although the first isolation of ''Intrasporangium'' was from an air sample, subsequent isolations have mainly been from various types of soil. The soil sources include a manganese mine, a former coal gasification site, a uranium-contanimated site, and the

rhizosphere The rhizosphere is the narrow region of soil or Substrate (biology), substrate that is directly influenced by root secretions and associated soil microorganisms known as the root microbiome. Pore space in soil, Soil pores in the rhizosphere can ...

s of a rice paddy and of ''

Jatropha curcas ''Jatropha curcas'' is a species of flowering plant in the spurge family, Euphorbiaceae, that is native to the American tropics: Mexico, the Caribbean and Central and South America. It is originally native to the tropical areas of the Americas ...

''.

References

{{Taxonbar, from=Q21216926 Intrasporangiaceae Bacteria genera