• Cajanus Adanson, 1763
• Caladonus Oman, 1949
• Calaenas Gray, 1845 accepted as Caloenas Gray, 1840
• Calambus Thomson, 1859
• Calaminus Townes in Townes, Momoi & Townes, 1965
• Calamitus Rafinesque, 1815 (unaccepted > nomen nudum)
• Calamodus Kaup, 1829 (uncertain)
• Calamops Sinclair, 1917 † (uncertain)
• Calamopus Deeleman-Reinhold, 2001
• Calamus Linnaeus, 1753 [Family: Arecaceae]
• Calamus Saussure, 1862 accepted as Cannula Bolivar, 1906 [Family: Acrididae]
• Calamus Swainson, 1839 [Family: Sparidae]
• Calanus Leach, 1816 [Family: Calanidae]
• Calanus Walker, 1870 accepted as Cannula Bolivar, 1906 [Family: Acrididae]
• Calapus Rafinesque, 1815 accepted as Calopus Fabricius, 1775
• Calarus Raffray, 1903
• Calathus Bonelli, 1810
• Calaxius Sakai & de Saint Laurent, 1989
• Calcinus Dana, 1851
• Calenus Dejean, 1836 accepted as Ellipticus Chevrolat in Dejean, 1836
• Calymmus Doué in Montrouzier, 1860
• Calymmus sensu Pascoe, 1871 accepted as Wattius Kaszab, 1982
• Camnus Gistl, 1848 accepted as Cosmisoma Audinet-Serville, 1834
• Catamonus Schönherr, 1845
• Caulanus Miller & Cribb, 2007
• Chalanus Fåhraeus in Harold, 1872 accepted as Sthenias Dejean, 1835
• Clemnus Redtenbacher, 1858 accepted as Clemmus Hampe, 1850
• Clemnus Schaum, 1852 accepted as Clemmus Hampe, 1850
• Cylanus Rafinesque, 1815 accepted as Cylas Latreille, 1802