Photo © 2006, Garth Catterall-Heart Sea UrchinSea urchins are spiny sea creatures of the class Echinoidea found in oceans all over the world. (The name comes from their resemblance to hedgehogs, hedgehog being one meaning of the word "urchin"). Their shell, which biologists call the test, is globular in shape, and covered with spines. The size of the test in adults is typically in the range of 3 to 10 cm (1-4 in.). Typical sea urchins have spines 1-2 cm (approximately ? to 1 in.) in length (e.g. "Sea urchin", right), a millimeter or two thick, and not terribly sharp. Diadema antillarum, familiar in the Caribbean, has thin spines that can be 10-20 cm long (4-8 in.). Common colors include black and dull shades of green, olive, brown, purple, and red. Sea urchins are members of the phylum Echinodermata, which also includes starfish, sea cucumbers, brittle-stars, and crinoids. Like other echinoderms they have five-fold symmetry (called pentamerism) and move by means of hundreds of tiny, transparent, adhesive "tube feet". The pentamerous symmetry is not obvious at a casual glance, but is easily seen in the dried shell of the urchin. From Wikipedia, the free encyclopedia Photo ID = 040917_109e_8085 Keywords = Sea Urchin Horizontal or Landscape Prints at special prices. This photo may be available in other sizes. |
Pick a quotation to add to this photo for only $25 extra
Order a 5x7 print |
Order a 8x10 print |
Order a 11x14 print |
Order a 5x7 print |
Order a 8x10 print |
Order a 11x14 print |
Order a 5x7 print |
Order a 8x10 print |
Order a 11x14 print |
Have a 900x1392 |
Have a 1440x1800 |
Have a 1980x3060 |
| Other photos taken at the same time as this photo. | |||||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
PhotosByGarth is a division of SpiritWorks Software Inc. |