Lab11_Mollusca_Annelida

Lab11_Mollusca_Annelida - lab10 lab11 lab12 lab13...

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1 lab10 lab11 lab12 lab13 Coelomates • Bilateral symmetrical • Have a coelomic body cavity surrounded by mesoderm and containing complex systems of organs and compartments. • Protostomes (phyla Mollusca, Annelida , Arthropoda) – Well-developed nervous, circulatory, excretory, reproductive, and digestive systems. • Deuterostomes (phyla Echinodermata, Hemichordata, Chordata)
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2 Phylum Molluska • Mollusks such as snails, clams, octopuses, and squids • Soft-bodied coelomates with a shell (may have no shell). • External shells, remnant internal shell or no shell (e.g., octopuses). • Coelomate of mollusks is often reduced to a small chamber surrounding the heart. • Open circulatory systems have a few large vessels and a heart. Mollusks • Body plan of mollusk shows little segmentation – Figure 38.2, 38.3 – Head-Foot: ventral, muscular, highly modified foot for locomotion – Visceral mass of organ systems and sensory structures – Mantle (a specialized layer of epidermal cells that secretes shell) – Calcium-based shell (occasionally absent)
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3 Classes of mollusks
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This note was uploaded on 02/25/2011 for the course BIO 138 taught by Professor Wu during the Summer '08 term at Staten Island.

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Lab11_Mollusca_Annelida - lab10 lab11 lab12 lab13...

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