bio lab report19 - Sheldon Pope (with Allison, Lam and...

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Sheldon Pope (with Allison, Lam and Eric) Bio 412 Lab Section 18 4-17-08 Echinoderms Introduction: Phylum echinodermata can be literally translated to spiny skin, this phyla contains organisms such as brittle stars, sea urchins, starfish, sand dollars, and sea cucumbers. All of these creatures dwell on the bottom of the ocean. The blastopore in an echinoderm becomes the anus which makes it a deuterostome. Echinoderms have a water vascular system which distributes nutrients and circulation through their body, they also have tube feet which enable them to move across mostly any terrain under the ocean. With five arms or extensions from the center of the body, echinoderms are pentamerous with radial symmetry. The larvae however have bilateral symmetry. There is an exoskeleton under the skin of all echinoderms; it is made of calcareous ossicles beneath tender skin. Some of these creatures are lucky enough to be able to regenerate lost body parts. Echinoderms reproduce sexually by external fertilization. Class Asteroidea contains the sea stars which were dissected in this lab. They have a
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bio lab report19 - Sheldon Pope (with Allison, Lam and...

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