Loricate, occasionally very weakly loricate. Lorica usually more or less dorso-ventrally depressed, angular, rectangular or hexagonal; anterior margins of lorica often with spines, caudally with or without spines or extensions; head and foot retractable in lorica. Foot present or absent, if present long and wrinkled or with pseudosegments; two small toes. Corona frontal with reduced ciliation, usually with single dorsal and 2‒4 humps with short cilia and cirri. Trophi malleate.