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Black sea cucumber, with dusting of sand on part of its ventral surface
Nearshore shallow water tropical coral reef ecosystem
Spotted at low tide (in about 4 inches/10 cm of water) on the reef flat south of Mokauea Island. Specimen was about 1 foot/0.3m long. Image note: view is through-water; unusual prismatic effects were caused by sunlight refracting as it entered a denser medium, the sea water, via wind-generated ripples on its surface.