Family
Cephalodiscidae Harmer, 1905
Selection of related publications
Öpik, A. 1930. Beiträge zur Kenntnis der Kukruse-(C2-C3-)Stufe in Eesti. IV.  Tartu Ülikooli Geoloogia Instituudi Toimetused   24,      1-34.
List of species
2. Pterobranchites antiquus Kozłowski, 1967 | Tremadocian
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Hemichordata | 
| Class | Pterobranchia | 
| Subclass | Cephalodiscida | 
| Family | Cephalodiscidae | 
| Genus | Aellograptus | 
| Atubaria | |
| Cephalodiscus | |
| Eocephalodiscus | |
| Melanostrophus | |
| Pterobranchites |