Anatomy Of A Sand Dollar

The petal like pattern in sand dollars consists of five paired rows of pores. Clypeaster subdepressus sand dollar sea biscuit which are found in the atlantic ocean and the caribbean sea from the carolinas to brazil.

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These sand dollars grow to about 4 inches across and have gray purple or blackish spines.

Anatomy of a sand dollar. Sand dollars also sometimes called sea biscuits or sea cookies are closely related to urchins sea cucumbers and starfish. Species and classification of sand dollars. We are working on a sand dollar diagram which will be available shortly.

There are many different species of sand dollars. They live on the sandy sea floor from the intertidal zone the area between high tide and low tide down to the subtidal zone the area below low tide. The term sand dollar refers to several species of flattened burrowing sea urchins that belong to the order clypeasteroida.

The mouth of the sand dollar is located on the bottom of its body at the center of the petal like pattern. The mouth of the sand dollar is located on the bottom of its body at the center of the petal like pattern. The pores are perforations in the endoskeleton through which podia for gas exchange project from the body.

Sand dollars also possess many tube like feet which are used for gills. The sand dollar is a spiny hard skinned animal that is shaped like a coin a flattened disk. The anus of sand dollars is located at the back rather than at the top as in most urchins.

Unlike other urchins the bodies of sand dollars also display secondary front to back bilateral symmetry. Sand dollar anatomy. Sand dollar anatomy the internal anatomy of a common sand dollar is made of rigid calcium carbonate skeleton called a test which is typical of all clypeasteroida members.

Much like the sea urchin the sand dollar actually does move. It does so by taking water into its body through 5 pores that take the shape of a flower on the top of its body. Though this animal seems sessile it is not.

Anatomy Of Animals