Sea urchins

Sea Urchin Sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton). The pores accommodate tube feet, which are slender, extensible, and often sucker-tipped. From nodules on the test arise long, movable spines and pedi cellariae (pincer like organs); these structures may have poison…

Sea urchins or urchins are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans a...

Sea urchin's shell, about an inch and a half in diameter. Stacked 4 macro shots to get focus from the top to bottom.

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Sea Urchin

The rare, spectacular and unique sea urchins seen in this image represent only a fraction of those displayed at the Sea Urchin Science Centre and Gallery in Sydney, Australia. The centre is the only one of its kind in the World, and it is open to the public. Seen here are tests - the internal skeleton - of the Class Echinoidea, commonly referred to as 'regular urchins'.

Sea urchins are social sea creatures.

Photos of Sea Urchins - Echinoidea