Odontogriphus omalus is a menber of the Burgess Shale faulna, a soft-bodied animal of the Middle Cambrian. It is considered a member of an early stem-group Mollusc ^{2, 3)}.

Odontogriphus is a slug-like shape, oblong or a rectangle with rounded corners, and is dorsoventrally compressed (in short, flat). It is about 125mm in length and about 43mm in width. The anterior half and posterior half of the body are neary similar shape. The dorsal surface has no any shells or spines ^{1), 2)}.

A radula (a molluscan feeding apparatus) with two or three chevron-like rows of teeth locates at the anterior ventral side, and behind it, a large and broad foot extends to the posterior end of the body. The both sides and posterior end of the foot is surrounded by gills or ctenidia (a respiratory organ of many molluscs) ^{1), 2)}.

Based on the shapes of radula and foot, Odontogriphus would have been crawling along biofilms on the rocks such as sheet-like masses of the cyanobacteria. They are often found together in the same layers. Odontogriphus may have fed on these biofilms and/or deposit mud of the seabed ^{1), 2), 3)}.