Abstract
Five new species of motile and nonsporeforming anaerobic gram-negative rods that have deoxyribonucleic acids with guanine-plus-cytosine contents of 56 to 58 mol%, produce major amounts of propionic and acetic acids, and were isolated from the human gingival crevice are described: Selenomonas noxia with ATCC 43542 as the type strain, Selenomonas flueggei with ATCC 43531 as the type strain, Selenomonas infelix with ATCC 43532 as the type strain, Selenomonas dianae with ATCC 43527 as the type strain, and Selenomonas artemidis with ATCC 43528 as the type strain.