Thermal Vent Clam (Calyptogena magnifica) Hemoglobin

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Science  25 Feb 1983:
Vol. 219, Issue 4587, pp. 981-983
DOI: 10.1126/science.219.4587.981


A heterodont bivalve mollusk Calyptogena magnifica, from the East Pacific Rise and the Galápagos Rift hydrothermal vent areas, contains abundant hemoglobin in circulating erythrocytes. No other known heterodont clam contains a circulating intracellular hemoglobin. The hemoglobin is tetrameric and has a relatively high oxygen affinity, which varies only slightly between 2° and 10°C. The presence of hemoglobin in the clam may facilitate the transport of oxygen to be used in chemoautotrophic hydrogen sulfide metabolism.