Marine Biology Phylum Note Sheet.docx

Marine Biology Phylum Note Sheet.docx - Marine Biology...

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Marine Biology Phylum Note Sheet Cnidaria ( jellies ) radially symmetrical, tentacles armed with nematocysts, digestive cavity with only one opening, vase shaped polyp (facing up) form, and bell-shaped (facing down) medusa, sexual/asexual reproduction Porifera ( Sponges ) no brains, osculum and choanocytes, have spicules, no tissues, asymmetrical, sessile Nematoda ( round worms ) unsegmented, bilaterally symmetrical Mollusca ( clams, snails, squids, octopus ) open circulatory system, some have hard shell made of calcium carbonate, regional specialization, must have: muscular foot, visceral mass, mantle Annelida ( segmented worms ) segmented body wall and internal organs Echinodermata ( starfishes, sea urchins, brittle stars, crinoids, and sea cucumbers
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