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Project Noah Nature School
Astropyga radiata
Reddish sea urchin with brown quills, about 4 inches/10 cm horizontal diameter, exclusive of spines; shell in five segments, with grooves along seams; blue spots in grooves.
Nearshore tropical waters.
Spotted offshore of Nanakuli, Oahu in a penshell bed on a flat sand bottom about 70 feet deep. Original medium photoprint taken using 35mm SLR in Ikelite housing with flash; print later scanned and image saved as digital file.
Spotted on Jul 4, 1979
Submitted on Dec 2, 2011
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