• Cosa H. J. Finlay, 1926
• Cosa auriculata Laseron, 1953 accepted as Cosa tatei (Hedley, 1901)
• Cosa awamoana (Laws, 1941) †
• Cosa bernardi (Tate, 1898) †
• Cosa bordaensis (Cotton, 1931)
• Cosa brasiliensis Klappenbach, 1966
• Cosa caribaea Abbott, 1958
• Cosa celsa (Cotton, 1931)
• Cosa costata (F. Bernard, 1896)
• Cosa crebreradiata (Cotton, 1931)
• Cosa dispar A. W. B. Powell, 1937
• Cosa filholi (F. Bernard, 1897)
• Cosa fimbriata (Tate, 1898)
• Cosa inconspicua (Olsson & McGinty, 1958)
• Cosa inornata (Hedley, 1904)
• Cosa kaawaensis Laws, 1936 †
• Cosa kinjoi Hayami & Kase, 1993
• Cosa laevicostata A. W. B. Powell, 1933
• Cosa orbicula Laws, 1950 †
• Cosa pacifica (Thiele, 1931)
• Cosa parallelogramma (Hedley, 1906)
• Cosa paramoea (Bartsch, 1915)
• Cosa pectinata (Hedley, 1902)
• Cosa pharetra Iredale, 1931
• Cosa pileata (Thiele, 1931)
• Cosa praenuntia (Tate, 1898) †
• Cosa sagana Iredale, 1931 accepted as Cosa pectinata (Hedley, 1902)
• Cosa scabra (Hedley, 1906)
• Cosa separabilis Laws, 1940 †
• Cosa serratocostata A. W. B. Powell, 1933
• Cosa serratocostata dispar A. W. B. Powell, 1937 accepted as Cosa dispar A. W. B. Powell, 1937
• Cosa stephensensis Laseron, 1953
• Cosa tardiradiata (Cotton, 1931)
• Cosa tatei (Hedley, 1901)
• Cosa tholiata P. G. Oliver & A. M. Holmes, 2004
• Cosa tholiatus P. G. Oliver & A. M. Holmes, 2004 accepted as Cosa tholiata P. G. Oliver & A. M. Holmes, 2004
• Cosa trigonopsis (F. W. Hutton, 1885) †
• Cosa uchimae Hayami & Kase, 1993
• Cosa waikikia (Dall, Bartsch & Rehder, 1938) accepted as Limopsis waikikia Dall, Bartsch & Rehder, 1938
• Cosa wanganuica Finlay, 1930 †
• Cosaglenchus Siddiqui & Khan, 1983 accepted as Coslenchus Siddiqi, 1978
• Cosaglenchus modicus Siddiqui & Khan, 1983 accepted as Coslenchus modicus (Siddiqui & Khan, 1983) Siddiqi, 1986
• Cosaglenchus rafiqus Siddiqui & Khan, 1983 accepted as Coslenchus rafiqi (Siddiqui & Khan, 1983) Siddiqi, 1986
• Cosalaimus Siddiqi, 1983
• Cosalaimus costatus Siddiqi, 1993
• Cosalaimus multistriatus (Khera, 1973)
• Cosalaimus striatus (Loof, 1964)
• Cosalaimus talonus Siddiqi, 1993
• Cosatova Iredale, 1939 accepted as Cratis Hedley, 1915
• Cosavirus