Family
Ceratretidae Rowell, 1965
Selection of related publications
Holmer, H., Popov, L. E. 1990. The acrotretacean brachiopod Ceratreta tanneri (Metzger) from the Upper Cambrian of Baltoscandia.  GFF   112,   3,   249-263. DOI:10.1080/11035899009454772
Popov, L. E., Khazanovich, K. K. 1989. Lingulata (inarticulate brachiopods with phosphate-calcium shell).  The Key sections and stratigraphy of the phosphate bearing Obolus beds of the North-East of the Russian platform, pp. 96-136.   Nauka. 
Kaljo, D., Borovko, N., Heinsalu, H., Khazanovich, K., Mens, K., Popov, L., Sergejeva, S., Sobolevskaya, R., Viira, V. 1986. The Cambrian-Ordovician boundary in the Baltic-Ladoga clint area (North Estonia and Leningrad Region, USSR).  Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология   35,   3,   97-108. DOI:10.3176/geol.1986.3.01
List of species
1. Ceratreta tanneri (Metzger, 1922) | Upper Cambrian (old nomenclature)
2. Keyserlingia buchii (Verneuil, 1845) | Upper Cambrian (old nomenclature)
3. Keyserlingia reversa (Verneuil, 1845) | Upper Cambrian (old nomenclature)
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Linguliformea | 
| Class | Lingulata | 
| Order | Acrotretida | 
| Superfamily | Acrotretoidea | 
| Family | Acrotretidae | 
| Biernatidae | |
| Ceratretidae | |
| Genus | Ceratreta | 
| Keyserlingia | |
| Family | Eoconulidae | 
| Ephippelasmatidae | |
| Scaphelasmatidae | |
| Torynelasmatidae | 
 See also