| 1885 Challengeria harstoni - Murray p. 226; pl. A, fig. 14a |
| 1887 Challengeria harstoni - Haeckel p. 1650 |
| 1899 Challengeria harstonii - Cleve p. 28 |
| 1900 Challengeria harstoni - Jørgensen p. 90 |
| 1901 Protocystis harstoni - Borgert p. XV28; fig. 30 |
| 1973b Protocystis harstonii - Dumitrica p. 755; pl. 8, fig. 5 |
| 1976 Protocystis harstoni - Bjørklund pl. 12, figs. 5-7 |
| 1981 Protocystis harstoni - Takahashi and Honjo pl. 11, fig. 11 |
| 1987 Protocystis harstoni - Swanberg and Bjørklund fig. 4M |
| 1991 Protocystis harstoni - Takahashi p. 141 [not figured] |
