Species
Hemicosmites extraneus Eichwald, 1840
Synonymy list
1840     Hemicosmites extraneus m. — Eichwald , pp. 211-212
1840     Hemicosmites extraneus m. — Eichwald , pp. 182-183
1856     Hemicosmites extraneus — Eichwald , pp. 124
1857     Hemicosmites extraneus — Eichwald , pp. 70
1860     Hemicosmites extraneus m. — Eichwald , pp. 634, fig. 32:5a.b
1899     Hemicosmites extraneus Eichwald (1840, III,182) — Jaekel , pp. 310
1945     Hemicosmites extraneus Eichwald, 1840 — Regnéll , pp. 1000
1979     Hemicosmites extraneus Eichwald, 1840 — Bockelie , pp. 365, fig. text fig. 17
Selection of related publications
Regnéll, G. 1945. Non-Crinoid Pelmatozoa from the Paleozoic of Sweden. A taxonomic study.  Meddelanden från Lunds Geologisk-Mineralogiska Institution   108,      1-255.  Carl Bloms Boktryckeri. 
Jaekel, O. 1899. Stammesgesihichte der Pelmatozoen. Erster Band. Thecoidea und Cystoidea. pp. 1-441.  Verlag von Julius Springer. 
Eichwald, E. 1856. Beitrag zur geographischen Verbreitung der fossilen Thiere Russlands. Alte Periode. (Fortsetzung).  Bulletin of the Moscow Society of Naturalists. Geological series   29,   1,   88-127.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Echinodermata | 
| Subphylum | Blastozoa | 
| Class | Rhombifera | 
| Superfamily | Hemicosmitida | 
| Family | Hemicosmitidae | 
| Genus | Hemicosmites | 
| Species | altus | 
| extraneus | |
| grandis | |
| malum | |
| oblongus | |
| oelandicus | |
| papaveris | |
| pocillum | |
| porosus | |
| pulcherrimus | |
| pyriformis | |
| rudis | |
| sculptus | |
| sphaericus | |
| variabilis | |
| verrucosus | 
References based on distribution
- Regnéll, 1945 Põõsaspea Cliff Jõhvi Substage
- Jaekel, 1899 Põõsaspea Cliff Jõhvi Substage
- Eichwald, 1856a Põõsaspea Cliff