Bacteria → Proteobacteria → Betaproteobacteria → Burkholderiales , Idiomarina , Idiomarinaceae
, Ignavigranum
, Ilyobacter
, Inquilinus , Intrasporangiaceae , Intrasporangium
, Iodobacter
, Isobaculum , Isochromatium , Isoptericola , Isosphaera
Bacteria → Cyanobacteria → Cyanophyceae → Nostocales → Symphyonemataceae