Archaeosporales is an order of fungi best known as arbuscular mycorrhiza to vascular land plants. But also form free living endocyte symbioses with cyanobacteria. The free living forms may have a Precambrian fossil record back 2.2 Ga, well before... Wikipedia
Order: Archaeosporales; C.Walker & A.Schüßler (2004)
Scientific name: Archaeosporales
Higher classification: Glomeromycetes