| Nominal Species (n = 21) | Present allocation (n = 19) | Ref. |
|---|---|---|
| Poromya albida Dall, 1886 | Poromya albida | 19 |
| Poromya butoni Prashad, 1932 | Cetomya butoni | 3477 |
| Dermatomya buttoni Dall, 1916 | Dermatomya buttoni | 19 |
| Poromya chilensis Dall, 1908 | Dermatomya chilensis | 3477 |
| Poromya cymata Dall, 1890 | Poromya cymata | 83435 |
| Poromya elongata Dall, 1886 | Poromya elongata | 19 |
| Poromya eximia Prashad, 1932 | Cetomya eximia | 3477 |
| Poromya eximia Pelseneer, 1911 | Cetomya eximia | 3477 |
| Dilemma frumarkernorum Leal, 2008 | Dilemma frumarkernorum | 83435 |
| Poromya houbricki Bernard, 1989 | Poromya houbricki | 19 |
| Corculum inexpectatum Crozier, 1966 | Dilemma inexpectatum | 3477 |
| Poromya laevis Dell, 1995 | Poromya laevis | 8121 |
| Poromya mactroides Dall, 1889 | Dermatomya mactroides | 3477 |
| Cetoconcha malespinae Ridewood, 1903 | Cetomya malespinae | 19 |
| Poromya microsculpta Smith, 1885 | Poromya microsculpta | 8121 |
| Poromya neaeroides Sequenza, 1877 | Cetomya neaeroides | 19 |
| Poromya rostrata Rehder, 1943 | Poromya rostrata | 19 |
| Poromya trosti Strong & Hertlein, 1937 | Poromya trosti | 19 |
| Poromya tuberata Jeffreys, 1882 | Cetomya neaeroides | 3477 |
| Poromya umbonata Knudsen, 1982 | Poromya umbonata | 83435 |
| Poromya undosa Hedley & Petterd, 1909 | Poromya undosa | 8121 |