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Lab #13 Phylum Echinodermata Phylum Chordata Phylum Echinodermata • Class Asteroidea – sea stars • Class Echinodea – sea urchins and sand dollars • Class Holothuroidea – sea cucumbers Class Asteroidea – Sea stars Class Asteroidea Dissection Class Asteroidea Dissection gonads Class Asteroidea Dissection gonads Class Asteroidea Dissection Class Asteroidea Dissection Class Asteroidea Dissection – test yourself 6 Class Echinodea – sea urchins and sand dollars Aristotle’s lantern and mouth intestine gonads gonads Sea urchin are Regular Echinoids http://www.stanford.edu/~seastar/VirtualUrch in/urchinanatomy.swf Class Echinodea – sea urchins and sand dollars Sand dollars are irregular Echinoids Class Holothuroidea spines tube feet Class Holothuroidea Class Holothuroidea ampulla of tube feet (red) longitudinal muscle circular muscle tentacles radial canal ring canal gonads Polian vesicle longitudinal muscle intestine ampulla of tube feet (red) Phylum Chordata • SubPhyla: – Urochodata: sea squirts (tunicates) • 45,000 species – Cephalochordata: amphioxus • 45 species – Hyperotreti: hagfishes – Vertebrata: vertebrates Hagfish Tunicates Phylum Chordata – Amphioxus (Lancelet) Phylum Chordata – Amphioxus (Lancelet) Phylum Chordata – Amphioxus (Lancelet) nerve cord pharyngel gill slits buccal mouth cavity Phylum Chordata – Amphioxus (Lancelet)
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