Lorica firm, nearly square in shape, divided into a dorsal, a ventral, and a basal plate. Anterior dorsal margin with six spines, nearly equal in length in some forms, though the medians are a little longer than the other pairs and curve somewhat ventrally. Mental margin rigid, undulate, raised toward the center. Small spines usually present at the junction of dorsal and basal plates. Foot opening large, nearly circular or club-shaped ventrally.
Anterior spines are all curved. The inner two spines curve outward, the intermediates and laterals usually curve inwards. The posterior end of the lorica usually broader than the anterior end. The three spines surrounding the foot opening are prominent.
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