Ctena orbiculata, commonly known as the dwarf tiger lucine,[2] is a species of bivalve mollusc in the family Lucinidae.

[2] The shell valves are nearly circular, the outer surface being sculptured with fine concentric rings and rather coarser radial lines.

[4] Like other members of its family Lucinidae, Ctena orbiculata does not have an inhalant siphon, instead rolling its elongated foot into a mucus-lined tube and drawing water into the gill cavity through this.

[5] Ctena orbiculata is native to the western Atlantic Ocean where its range extends from North Carolina to the Caribbean Sea.

These chemoautotrophic bacteria use the energy released by the oxidation of sulphur compounds to fix carbon dioxide and convert the products into more complex organic molecules which become available to the mollusc.