Species
Heliocrinites ovum (Schlotheim, 1826)
Synonymy list
1826     Echinosphaerites ovum Schloth. — Schlotheim , pp. 309
1899     Caryocystites ovum v. Schlotheim 1826 — Jaekel , pp. 330
1923     Caryocystites ovum v. Schlotheim sp. — Hecker , pp. 52-53
1970     Heliocrinites ovum (Schlotheim) — Rõõmusoks , pp. 78
Selection of related publications
Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I. pp. 1-346.  Valgus. 
Hecker, R. F. 1923. Echinosphaeritidae of the Silurian of Russia.  Trav. Mus. Géol. Min. Pierre le Grand Acad. Sci. Russie   IV,   1,   1-63.
Jaekel, O. 1899. Stammesgesihichte der Pelmatozoen. Erster Band. Thecoidea und Cystoidea. pp. 1-441.  Verlag von Julius Springer. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Echinodermata | 
| Subphylum | Blastozoa | 
| Class | Rhombifera | 
| Superfamily | Caryocystitida | 
| Family | Caryocystitidae | 
| Genus | Heliocrinites | 
| Species | balticus | 
| guttaeformis | |
| laevis | |
| ovalis | |
| ovum | |
| prominens | |
| radiatus | |
| stellatus | 
References based on distribution
- Hecker, 1923 Ordovician
- Rõõmusoks, 1970a Kostivere karst field Lasnamägi Stage
- Jaekel, 1899