Green Sea Urchin
Strongylocentrotus droebachiensis

f22 @ 1/60S, ASA 64, Ektachrome 64 slide film, Nikonos II w 28mm and close up lens, Oceanic 2000 flash and Ikelite slave flash


"Strongylocentrotus droebachiensis," Wikipedia, the free encyclopedia. Strongylocentrotus droebachiensis is commonly known as the green sea urchin because of its characteristic green color. It is commonly found in northern waters all around the world including both the Pacific and Atlantic Oceans to a northerly latitude of 81 degrees and as far south as Maine[1] (in the U.S.) and England. Strongylocentrotus droebachiensis is in the shape of a slightly flattened globe (dorsoventrally). The oral side rests against the substratum and the aboral side (the side with the anus) is in the opposite direction. It has pentameric symmetry, which is visible in the five paired rows of podia (tube feet) that run from the anus to the mouth. The size is calculated as the diameter of the test (the body not including the spines). This is a relatively fast growing sea urchin, and its age is generally calculable based on its size: one year for every 10 mm.
Halibut Point, Rockport, Massachusetts
 
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