Archerd Shell Collection > Shell Classes > Bivalvia > Chamidae

Family: Chamidae (Jewel Boxes)

Chama is an oyster-like bivalve that has developed a permanently attached mode of life. Its deeply conical right valve (in the pictures at right, the upper valve) is cemented to some substrate, while the somewhat flattened left valve forms an operculum-like cover. Consistent with its immobility, the foot is greatly reduced.
Chama is a sole surviving genus of a very prolific group of fossil oysters dating from the Jurassic and Cretaceous periods, some 200 million years ago. It is of interest mainly because it seems to occupy an intermediate evolutionary step between two extinct families of the Chamacea superfamily.
Class: Bivalvia
Subclass: Heterodonta
Order: Veneroida
Superfamily: Chamacea
Family: Chamidae
Major Genera
  • Genus: Arcinella
  • Genus: Chama
  • Genus: Pseudochama

Chama reflexa (Reeve, 1846)
Reflexed Jewel Box

Archerd Shell Collection > Shell Classes > Bivalves > Jewel Boxes