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|Panenka bohemica (Antipleuridae) from Czech Republic, at the National Museum (Prague)|
The valves of the shell are relatively thin and somewhat elongated. Unlike most other bivalves, species in this group have no hinge teeth on their shells. They have relatively primitive, "protobranchiate", gills.
- Order †Praecardioida
- Order Solemyoida
- Superfamily Solemyoidea
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