Abstract
1. 1. The gills of Leptograpsus variegatus contain a high-affinity, Ca 2+-activated ATPase, probably located in the basolateral plasma membrane of the gill epithelia. 2. 2. The affinity of the ATPase for Ca 2+ is in the micromolar concentration range (6–35 μmol/1). 3. 3. The specific activity of the enzyme did not change during the moult cycle. The ATPase probably does not contribute substantially to increased calcium influx from the medium during the post moult period. 4. 4. The enzyme is believed to function as a selective extrusion mechanism involved in the maintenance of a low cytosolic Ca 2+ level in the epithelial cells.
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