Genus
Pycnolithus Lindström, 1899
Selection of related publications
Bondarenko, O. B. 1992. Sistema geliolitoidei [The system of heliolitoids]. pp. 1-205.  Moskovskoe Obŝestvo Ispytateli Prirody. 
List of species
1. Pycnolithus bifidus Lindström, 1899 | lower Silurian
Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Cnidaria | 
| Subphylum | Anthozoa | 
| Subclass | Tabulata | 
| Superorder | Heliolitoidea | 
| Suborder | Heliolitina | 
| Superfamily | Coccoseridicae | 
| Family | Pycnolithidae | 
| Genus | Pycnolithus | 
| Species | bifidus |