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 |