1887 Challengeria tridens - Haeckel p. 1651; not figured |
1899 Challengeria tridens - Cleve p. 28; not figured |
1900 Challengeria tridens - Jørgensen p. 90; not figured |
1901 Protocystis tridens - Borgert p. 29; fig. 33 |
1905 Protocystis tridens - Jørgensen p. 141; not figured |
1974 Protocystis tridens - Bjørklund fig. 9 |
1976 Protocystis tridens - Bjørklund pl. 12, figs. 1-3 |