Suborder
Metriophyllina Spasskiy, 1965
Selection of related publications
Neuman, B. E. E. 1988. Some aspects of life strategies of Early Palaeozoic rugose corals.  Lethaia   21,   2,   97-114. DOI:10.1111/j.1502-3931.1988.tb02061.x
Dybowski,  W. 1874. Monographie der Zoantharia sclerodermata rugosa aus der Silurformation Estlands, Nord-Livlands und der Insel Gotland, nebst einer Synopsis aller palaezoischen Gattungen  dieser Abtheilung und einer Synonymik der dazu gehörigen, bereits bekannten Arten.  Archiv für die Naturkunde Liv-, Ehst- und Kurlands   5,   3,   257-414.  Heinrich Laakmann. 
List of species
2. Petraia expansa (Hall, 1847) | Silurian
3. Petraia inflata Dybowski, 1873 | Vormsi Stage
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Cnidaria | 
| Subphylum | Anthozoa | 
| Subclass | Rugosa | 
| Order | Stauriida | 
| Suborder | Arachnophyllina | 
| Aulophyllina | |
| Calostylina | |
| Columnariina | |
| Cyathophyllina | |
| Ketophyllina | |
| Lycophyllina | |
| Metriophyllina | |
| Family | Hadrophyllidae | 
| Laccophyllidae | |
| Petraiidae | |
| Suborder | Monacanthina | 
| Plerophyllina | |
| Ptenophyllina | |
| Stauriina | |
| Streptelasmatina | |
| Genus | Nanophyllum |