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 glands.
Sea Urchin
Sea Urchin
Sea Urchin
Sea Urchin
Sea Urchin
Sea Urchin
Sea Urchin
Sea Urchin
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