Selenomonas

A genus of bacteria of uncertain taxonomic affiliation, containing curved to crescentic or helical, Gram-negative, strictly anaerobic rods that are motile with an active tumbling motion. Several flagella are present in a tuft, often near the center of the concave side. The type species, S. sputigena, is found in the human buccal cavity. [G. selene, moon, + monas, single (unit)]

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Se·le·no·mo·nas (se″le-no-moґnas) [Gr. selēnē moon + monas unit, from monos single] a genus of gram-negative, anaerobic bacteria of the family Acidaminococcaceae, found in the gastrointestinal tract of mammals and in contaminated river water and consisting of motile, curved to helical rods with a tuft of flagella near the center of the concave side, occurring singly and in chains. It includes the type species S. sputiґgena, found in the human oral cavity, and S. ruminanґtium, found in the rumen contents of animals.