Species
Pentagonocyclicus constrictus Yeltyschewa, 1964
Synonymy list
1964     Pentagonocyclicus constrictus Yeltyschewa sp. nov. — Yeltyschewa , pp. 75, fig. II 19-21; IV 23a
Selection of related publications
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) | 
| Genus | Pentagonocyclicus (col.) | 
| Species | Pentagonocyclicus bifidus | 
| Pentagonocyclicus concentricus | |
| Pentagonocyclicus constrictus | |
| Pentagonocyclicus inaequalis | |
| Pentagonocyclicus stellatus | |
| Pentagonocyclicus subhelenae | 
References based on distribution
- Yeltyscheva, 1964 Vassilkovo, Leningrad Oblast Volkhov Stage
- Yeltyscheva, 1964 Rannamõisa cliff Volkhov Stage
- Yeltyscheva, 1964 Popovka River, Leningrad Oblast Volkhov Stage