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Bio; Lecture 20; Survey of the Animal Kingdom

Bio; Lecture 20; Survey of the Animal Kingdom - Principles...

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Principles of Biology BIO U103 February 28, 2007 Protostomes Spiral cleavage Schizocoelous Blastopore becomes mouth Mollusca Common names o Snails, slugs, oysters, clams, octopuses, squid Habitat o Most are marine o Some inhabit fresh water o Some snails and slugs live on land Eucoelomates —schizocoelos Have a muscular foot , which enables them to burrow in sand Visceral mass o Area of mollusk where all organs are clumped together o Covered by mntle Mantle o Covrs or drapes itself over the visceral mass o Secretes calcium carbonate which becomes the shell Shell o Most mollusks have a shell o Some are internal, such as in the squid o Not all do, however Open circulatory system o Hemolymph : liquid that circulates through mollusks that contains nutrients and gasses o not carried in vessels o all organs are bathed in the hemolymph o arthropods also have hemolymh o one or more herts pump hemolymph into sinuses. o In a closed circulatory system : Heart pumps blood all through the body in vessels, and returns to the heart Squid and octopuses have closed circulatory systems Soft bodied—but protected by a shell Non-segmented Radula o Organ located in the mouth
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