Species
Pentagonocyclicus inaequalis Yeltyschewa, 1966
Synonymy list
1966     Pentagonocyclicus inaequalis Yeltyschewa, sp. nov. — Yeltyschewa , pp. 60-61, fig. III 12-13
1986     Pentagonocyclicus inaequalis Yeltyschewa, 1966 — Stukalina , pp. 87
Selection of related publications
Yeltyscheva, R. S. 1966. Stebli ordovikskih morskih lilij Pribaltiki (srednij ordovik).  Voprosy paleontologii   V,      53-70.  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, 1966 Vasalemma Keila Stage
- Yeltyscheva, 1966 Üksnurme Oandu Stage