Species
Simplocrinus crassiformis (Yeltyschewa, 1964)
Synonymy list
1964     Cyclocyclicus crassiformis Yeltyschewa sp. nov. — Yeltyschewa , pp. 76, fig. II 10
1984     Simplocrinus crassiformis (Yelt.) — Hynda , pp. 63
2000     Simplocrinus crassiformis — Stukalina , pp. 286
Selection of related publications
Stukalina, G. A. 1986. Zakonomernosti istoričeskogo razvitiâ krinoidej v rannem i srednem paleozoe SSSR. pp. 1-144.  Nauka. 
Yeltyscheva, R. S. (Yeltyschewa, R. S.) 1964. Stebli ordovikskih morskih lilij Pribaltiki (nižnij ordovik).  Voprosy paleontologii   IV,      59-82.  Izdatel'stvo Leningradskogo Universiteta. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Echinodermata | 
| Subphylum | Pelmatozoa | 
| Class | Crinoidea | 
| Organism group | Stemmed echinoderms outgroup (informal) | 
| Family | Cyclomischidae | 
| Genus | Simplocrinus | 
| Species | crassiformis | 
References based on distribution
- Yeltyscheva, 1964 Isvos, Leningrad Oblast Volkhov Stage
- Yeltyscheva, 1964 Obukhovo outcrop, Leningrad district Volkhov Stage
- Yeltyscheva, 1964 [Duplicate record of 12327] Putilovo Quarry Volkhov Stage
- Yeltyscheva, 1964 Popovka River, Leningrad Oblast Volkhov Stage
- Yeltyscheva, 1964 Rannamõisa cliff Volkhov Stage
- Yeltyscheva, 1964 Iru quarry Volkhov Stage
- Yeltyscheva, 1964 Kunda Volkhov Stage
- Stukalina, 1986 Jõhvi Substage