To learn more about living gastropods go to the Gastropods page in the Natural History segment of Nearctica . We have not found any web sites specifically about gastropods. Try some of the links in the general paleontological page. The bivalves are characterized by bilateral symmetry and two calcareous valves connected by a hinge. The fossil record for the bivalves ranges from the early Cambrian to the Recent.
Bivalves are both marine and freshwater.
To learn more about living bivalves go to the Bivalves page in the Natural History segment of Nearctica . We have not found any web sites specifically about gastropods. Try some of the links in the general paleontological page. All rights reserved.