Levels of Taxonomy- Domain-A more inclusive category than any other.It is larger than a kingdom Kingdom-A group of closely related Phylums Phylum-A group of closely related Classes Class-A group of closely related Orders Order-A group of closely related Families Family-A group of closel related Genuses Genus-A group of closely related Species Species -A group of closely related Organisms Classisfication System- The classification systems of both Aristotle and Linnaeus started with the same two groups: Plants and Animals. Linnaeus called these groups kingdoms. But, unlike Aristotle, Linnaeus divided kingdom into five levels: class, order, genus, species, and variety. Taxonomy- The discipline of classifying organisms and assigning each organism a universally accepted name.