Enrolled specimens of the five species of Late Cambrian trilobites are described from the Davis Formation of Southeast Missouri. Two additional species represented by cranidia are reported for the first time from this formation. These trilobites exhibit a partial spiral enrollment in which part of the pygidium is concealed beneath the triangular cranidial anterior border, with the pygidial axial ring acting as a stopping device against the anterior edge of the cranidial border. These trilobites are interpreted to have been active benthic scavengers with good visual fields that enrolled as they were buried by a sudden influx of terrigenous mud. This catastrophic event preserved them as whole enrolled specimens rather than as disarticulated parts, which is the normal preservation of Late Cambrian trilobites.--Journal abstract.

You do not currently have access to this article.