1. Curved backward or inward
   - recurved

See also: curved, curving

• family Clupeidae
• family Clusiaceae
• family Cobitidae
• family Coccidae
• family Coccinellidae
• family Coerebidae
• family Colchicaceae
• family Colubridae
• family Columbidae
• family Comatulidae
• family Combretaceae
• family Commelinaceae
• family Compositae
• family Congridae
• family Connaraceae
• family Convallariaceae
• family Convolvulaceae
• family Coprinaceae
• family Coraciidae
• family Cordaitaceae
• family Cordylidae
• family Coregonidae
• family Coreidae
• family Corixidae
• family Cornaceae