| Amphora bigibba var. interrupta (Grunow) Cleve, 1895 |
| Amphora bigibbosa Cleve, 1895 |
| Amphora binodis W. Greg., 1857 |
| Amphora binodis var. bigibba Grunow, 1899 |
| Amphora borealis Kütz., 1844 |
| Amphora capensis A. Schmidt, 1875 |
| Amphora caroliniana Giffen, 1980 |
| Amphora catharinaria Cholnoky, 1968 |
| Amphora cingulata Cleve, 1875 |
| Amphora clara A.W.F. Schmidt, 1875 |
| Amphora clevei Grunow, 1875 |
| Amphora coffeaeformis (C. Agardh) Kütz., 1844 |
| Amphora coffeaeformis var. acutiuscula (Kütz.) Hustedt, 1930 |
| Amphora coffeaeformis var. borealis (Kütz.) Cleve, 189 |
| Amphora coffeaeformis var. perpusilla Grunow, 1884 |
| Amphora coffeaeformis var. salina (W. Sm.) Schönfeldt, 1953 |
| Amphora commutata Grunow, 1880 |
| Amphora contracta Grunow, 1875 |
| Amphora copulata (Kütz.) Schoeman & Archibald, 1986 |
| Amphora costata W. Sm., 1853 |