Species
Protocrinites fragum Eichwald, 1856
Synonymy list
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
Selection of related publications
Phleger, F. B. 1935. Some Ordovician cystids from Russia.  Bulletin of the Museum of Comparative Zoology. Harvard University Museum of Comparative Zoology   LXXVI,   5,   193-201.
Jaekel, O. 1899. Stammesgesihichte der Pelmatozoen. Erster Band. Thecoidea und Cystoidea. pp. 1-441.  Verlag von Julius Springer. 
Eichwald, E. 1860. Lethaea Rossica ou Paléontologie de la Russie. Premier volume. Ancienne Période en deux sections. pp. XIX+1–1657.  E. Schweizerbart.  DOI:10.5962/bhl.title.52391
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Echinodermata | 
| Subphylum | Blastozoa | 
| Class | Diploporita | 
| Superfamily | Glyptosphaeritida | 
| Family | Protocrinitidae | 
| Genus | Protocrinites | 
| Species | fragum | 
| oviformis | |
| yakovlevi | 
References based on distribution
- Phleger, 1935 Putilovo quarry, Leningrad Oblast Kunda Stage
- Phleger, 1935 Lynna river, Leningrad Oblast Kunda Stage
- Jaekel, 1899 Pulkovo, Leningrad District
- Eichwald, 1860a Tsarskoye Selo, Leningrad Oblast