The four-kingdom scheme of classification

kingdom members

Virus

Monera bacteria, blue-green algae, archaebacteria, and prochlorophytes

Plantae algae, slime molds, true fungi, bryophytes (mosses, liverworts, and hornworts), ferns, psilophytes, lycopodiophytes, conifers, gnetophytes, ginkgophytes, cycads, and flowering plants

Animalia protozoans, sponges, corals, flatworms, tapeworms, arthropods, mollusks, lamp shells, annelids, bryozoans, echinoderms, hemichordates, and chordates, including the vertebrates