What Were Two Types of Organisms in the Kingdom Monera?

The kingdom Monera included bacteria and cyanobacteria. Classification systems change when technologies such as DNA sequencing provide new information about the relationship between organisms. A three-domain system consisting of Bacteria, Archaea and Eukarya supplanted the five-kingdom system, and Monera is obsolete.

One functional classification system divides organisms by their cell types rather than their genomes. Bacteria belong to the prokaryotes, distinguished by the lack of a nucleus and membrane-enclosed organelles in their cells. Most prokaryotes are single-celled organisms only visible under a microscope. Eukaryotes include protists, fungi, plants and animals. Archaea are prokaryotes that share some characteristics with eukaryotes, including similar genes.