Mollusca_Annelida

Mollusca_Annelida - Exercise 37 Phyla Mollusca and Annelida...

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    Exercise 37 Phyla Mollusca and  Annelida BIOL 1740
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    Exercise Objectives Describe how structures specific to mollusks and  annelids help them survive in their environment and  promote their evolutionary persistence. Describe the general morphology of organisms of  phylum Mollusca and phylum Annelida. List the characteristics that phyla Mollusca and  Anelida have in common with phyla Platyhelminthes  and Nematoda. List examples of each of the major classes of  mollusks and annelids. Understand the differences between acoelomate,  pseudocoelomate, and coelomate and know which  phyla are associated with each.
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    Today’s Overview Introduction to the phyla Mullusca and Annelida Introduce classification within each phyla Compare and contrast  Questions Complete exercise 37 Dissect Earthworm, Clam, Snail, Squid Clean up Quiz
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    Quick Summary To this point we have discussed: Organisms that possess fewer than three germ layers  (Porifera and Cnidaria) Those that possess three layers but are solid-bodied  (Platyhelminthes and Nematoda) Those that possess all three layers and have a body cavity, but  not ‘true’ coelomates Platyhelminthes – Acoelomates (mesoderm is a solid mass  of tissue w/ no internal cavity surrounding mesoderm) Nematoda – Pseudocoelomates (fluid-filled space between  the body wall and digestive tract) The next three animal phyla discussed will ALL BE  PROTOSTOME COELOMATES!!! 
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    Coelomates Phylua Mullusca and Annelida True coelomates because they not only  possess a body cavity, but also because the  cavity is completely lined with mesoderm. Coelomate animals are divided into two  groups based on embryological development: Protostomes and Dueterostomes Mullusks, Annelids, and Arthropods are  PROTOSTOME COELOMATES because the  exibit determinite, spiral cleavage and because the  first opening, or blastopore, forms the mouth.
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    FINALLY COELOMATES What’s the big deal? Evolutionary reasons Adaptations Increased diversity Importance of functioning organs Complexity of tissues and organs
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    Phylum Mollusca “Soft-bodied” Examples:  Snails, Slugs, Clams,  Scallops, Oysters, Cuttlefish, and  Octopuses
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    Background Info. Extremely diverse  phylum (~110,000  described  species). “Soft-bodied”=  specialized layer of  epithelial cells called a  MANTLE! Level of Org.:  Organ 
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Mollusca_Annelida - Exercise 37 Phyla Mollusca and Annelida...

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