Family
Ptychophyllidae Dybowski, 1873
Selection of related publications
Kaljo, D. L. 1958. Some new and little-known Baltic Tetracorals.  ENSV TA Geoloogia Instituudi Uurimused   III,      101-123.
List of species
1. Cyathactis balticus Kaljo, 1958 | Juuru Stage
2. Cyathactis tenuiseptatus Soshkina, 1955 | Silurian
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Cnidaria | 
| Subphylum | Anthozoa | 
| Subclass | Rugosa | 
| Order | Stauriida | 
| Suborder | Cyathophyllina | 
| Family | Campophyllidae | 
| Cyathophyllidae | |
| Ptychophyllidae | |
| Genus | Cyathactis | 
| Ptychophyllum | |
| Family | Zaphrentidae |