In scientific classification used in biology, the order (Latin: ordo, plural ordines) is a taxonomic rank between class and family. The superorder is a rank between class and order. Exact details of formal nomenclature depend on the Nomenclature Code which applies. Most of orders ends up with word -iformes, except for mammals and invertebrates. History of the concept The order as a distinctive rank of biological classification having its own distinctive name (and not just called a higher genus… (More on Suborder)