Simple Sea Urchin Anatomy

Wednesday, March 4, 2015

Simple Sea Urchin Anatomy

Test of a phyllacanthus imperialis a cidaroid sea urchin. At metamorphosis the sea urchin takes on the characteristic five sided penta radial design.

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Test of an echinodiscus tenuissimus an irregular sea urchin sand dollar.

Simple sea urchin anatomy. Urchins are part of the phylum echinoderm and their name comes from ancient greek echinos meaning hedgehog and derma meaning skin. They are usually globe shaped and protected by calcareous plates and spines. Prickly critters may use their feet as retinas study says.

Learn vocabulary terms and more with flashcards games and other study tools. They have hard rounded shells covered with sharp movable spines. 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.

Sea urchin anatomy one look at a sea urchin and you can see why they would be called sea hedgehogs. Interesting information about the sea urchin. They have hard rounded shells covered with sharp movable spines.

The pores accommodate tube feet which are slender extensible and often sucker tipped. Sea urchins are the class echinoidea of the phylum echinodermata. Sea urchin body is one big eye.

Sea urchins are unsegmented and penta radial as adults. Test of an echinus esculentus a regular sea urchin. Start studying sea urchin anatomy.

Like the rest of the echinoderms literally spike skinned they are entirely marine. Sea urchins may use the entire surfaces of their bodiesfrom the ends of their feet to the tips of their spinesas huge eyes. Close up of the test showing an ambulacral groove with its two rows of pore pairs.

Urchins are part of the phylum echinoderm and their name comes from ancient greek echinos meaning hedgehog and derma meaning skin. Close up on a. The sea star is an enchinoderm with simple functions but yet is very different from many other organisms in its overall capability.

From fertilization to just before metamorphosis the young sea urchin is bisymetrical as are humans. Sea urchin anatomy one look at a sea urchin and you can see why they would be called sea hedgehogs.