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Lecture 20 � Coelomate Deuterostomes � Echinoderms

Lecture 20 � Coelomate Deuterostomes � Echinoderms

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Lecture 20 – Coelomate Deuterostomes – Echinoderms A. Phylum Echinodermata Characteristics (fig.31-1) 1. Deuterostomes – “second the mouth;” the blastopore develops into the anus (like us); the mouth develops from a second opening opposite of the blastopore 2. Marine 3. Bilateria - sea stars (have pentaradial symmetry, means the body parts are arranged in 5; the larva however have bilateral symmetry) 4. Ciliated epidermis, endoskeleton – echinoderm literally means “spiny skin); the skin is ciliated and the skeleton is what is spiny on the inside 5. Water vascular system (fig. 31-2) – considered a derived characteristic; a system that sea water flows through – there is a plate with holes on top of the sea star called the madreporite. The madreporite leads to the stone canal which leads to the ring canal. From the ring canal, the radial canals extend through the arms to the “tube foot.” The tube foot consists of an ampulla (muscular and controls the hundreds of tube feet) and sucker. Some think this
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