HERVE CONGE,ISM / SCIENCE PHOTO LIBRARY HERVE CONGE,ISM / SCIENCE PHOTO LIBRARY
Sand dollar shell. The holes on the surface of the shell (test) are pores through which the animal uses to move water into its internal water- vascular system. A sand dollar (Class Echinoidea) is an echinoderm closely related to the sea urchin. A key distinguishing feature of this animal is its five-fold (pentameral) symmetry.
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