Genus
Apidium Stolley, 1896
Selection of related publications
Gnilovskaya, M. B. 1972. The Calcareous Algae of the Middle and Late Ordovician of the Eastern Kazakhstan. pp. 1-196.  Nauka. 
Stolley, E. 1898. Neue Siphoneen aus baltischen Silur.  Archiv für Antropologie und Geologie Schleswig-Holsteins und der benachbarten Gebiete   3,   1,   40-67.
List of species
1. Apidium krausei (Kiesow, 1893) | Jõhvi Substage
2. Apidium pygmaeum Stolley, 1896 | Jõhvi Substage
3. Apidium rotundum Høeg, 1932 | Upper Ordovician
4. Apidium sororis Stolley, 1896 | Jõhvi Substage
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Classification
| Organism group | Biota | 
| Kingdom | Plantae | 
| Organism group | Algae (informal) | 
| Phylum | Chlorophyta | 
| Subphylum | Siphonales | 
| Class | Receptaculitaphyceae | 
| Order | Cyclocrinales | 
| Family | Apidiacea | 
| Genus | Apidium | 
| Species | krausei | 
| pygmaeum | |
| rotundum | |
| sororis |