| Nominal Species (n = 27) | Present allocation (n = 26) | Ref. |
|---|---|---|
| Placiphorella borealis Pilsbry, 1893 | Placiphorella borealis | 19 |
| Plaxiphora boydeni Murdoch, 1982 | Plaxiphora boydeni | 3477 |
| Mopalia cirrata Berry, 1919 | Mopalia cirrata | 19 |
| Mopalia cithara Berry, 1951 | Mopalia imporcata | 75097 |
| Mopalia egretta Berry, 1919 | Mopalia egretta | 19 |
| Plaxiphora fernandezi Thiele, 1909 | Plaxiphora fernandezi | 3477 |
| Mopalia ferreirai Clark, 1991 | Mopalia ferreirai | 19 |
| Plaxiphora gwenae Ferreira, 1987 | Plaxiphora gwenae | 3477 |
| Mopalia imporcata Carpenter, 1864 | Mopalia imporcata | 19 |
| Plaxiphora kamehamehae Ferreira & Bertsch, 1979 | Plaxiphora kamehamehae | 3477 |
| Mopalia kennerleyi Carpenter, 1864 | Mopalia kennerleyi | 3477 |
| Mopalia laevior Pilsbry, 1918 | Mopalia laevior | 19 |
| Mopalia lowei Pilsbry, 1918 | Mopalia lowei | 19 |
| Plaxiphora mercatoris Leloup, 1936 | Plaxiphora mercatoris | 3477 |
| Placiphorella mirabilis Clark, 1994 | Placiphorella mirabilis | 19 |
| Plaxiphora murdochi Suter, 1905 | Plaxiphora murdochi | 3477 |
| Plaxiphora obtecta Carpenter, 1893 | Plaxiphora obtecta | 3477 |
| Placiphorella pacifica Berry, 1919 | Placiphorella atlantica | 75097 |
| Mopalia phorminx Berry, 1919 | Mopalia phorminx | 19 |
| Mopalia porifera Pilsbry, 1893 | Mopalia porifera | 19 |
| Mopalia recurvans Barnawell, 1960 | Mopalia recurvans | 19 |
| Placiphorella rufa Berry, 1917 | Placiphorella rufa | 19 |
| Mopalia sinuata Carpenter, 1864 | Mopalia sinuata | 19 |
| Mopalia spectabilis Cowan & Cowan, 1977 | Mopalia spectabilis | 19 |
| Mopalia swanii Carpenter, 1864 | Mopalia swanii | 19 |
| Placiphorella velata Dall, 1879 | Placiphorella velata | 19 |
| Chiton vespertinus Gould, 1852 | Mopalia vespertina | 3477 |