1846
Protocrinus oviformîs — Volborth, pp. 191, fig. 10:8-11
1855
Protocrinites fragum — Eichwald, pp. 227
1856
Protocrinus fragum — Eichwald, pp. 122
1857
Protocrinus fragum — Eichwald, pp. 68
1860
Protocrinus fragum m. — Eichwald, pp. 621
1861
Protocrinus fagum m. — Eichwald, pp. 177
1899
Protocrinites fragum Eichw. 1860 — Jaekel, pp. 433, fig. V 1-5
1935
Protocrinus fragum Eichwald — Phleger, pp. 201