[viruses] Realm Riboviria Order Nidovirales Suborder Mesnidovirineae Family Mesoniviridae [monotypic] Subfamily Hexponivirinae [monotypic] Genus Alphamesonivirus 1 Subgenus Casualivirus [monotypic] 2 Subgenus Enselivirus [monotypic] 3 Subgenus Hanalivirus [monotypic] 4 Subgenus Kadilivirus [monotypic] 5 Subgenus Karsalivirus 6 Subgenus Menolivirus [monotypic] 7 Subgenus Namcalivirus [monotypic] 8 Subgenus Ofalivirus [monotypic]