| 1887 Amphirhopalum ypsilon - Haeckel p. 522 |
| 1887 Amphicraspedum wyvilleanum - Haeckel p. 523; pl. 45, fig. 12 |
| 1966 Amphicraspedum wyvilleanum - Benson p. 221-222; pl. 11, figs. 5-6 |
| 1970 Amphirhopalum ypsilon - Nigrini p. 168; pl. 2, fig. 2 |
| 1979 Amphirhopalum ypsilon - Nigrini and Moore p. S75-S77; pl. 10, figs. 1a-e |
| 1983 Amphirhopalum ypsilon - Benson p. 500; pl. 2, figs. 4-7 |
