Family
Hippocardiidae Pojeta et Runnegar, 1976
Selection of related publications
Kiselev, G. N., Sinicyna, I. N., Isakar, M. A., Mironova, M. G., Saladzhius, V. Y. 1990. Atlas mollûskov verhnego ordovika i silura severo-zapada Vostočno-Evropejskoj platformy. pp. 1-80.  Leningrad University. 
Pojeta, J., Runnegar, B. 1976. The paleontology of rostroconch mollusks and the early history of the phylum Mollusca.  Geological Survey of Finland. Professional Paper      968,   1-85.
List of species
1. Hippocardia pygmaea (Hisinger, 1837) | Porkuni Stage
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Rostroconchia | 
| Order | Conocardiida | 
| Superfamily | Hippocardioidea | 
| Family | Hippocardiidae | 
| Genus | Bigalea | 
| Hippocardia | |
| Family | Pseudobigaleaidae |