Lab_6 Annelida & Mollusca

Lab_6 Annelida & Mollusca - Lab 6Phyla Annelida and...

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1 Lab 6—Phyla Annelida and Mollusca This lab focuses on even more complicated animals than you have seen thus far. In addition to three tissue layers and a cephalized body plan, as you saw in the flatworms (Platyhelminthes), you now will see organism that possess a fluid-filled cavity called a coelom. In lecture you will have learned that the coelom has several important roles, including the basis of the annelid skeletal structure. In addition to the coelom, these organisms have a complete gut and associated with the complete gut is the specialization of certain regions of the gut. One other significant difference between these animals and those from last week’s lab is the presence of a circulatory system. A transport system is now necessary in order to move oxygen from the outer regions of the animal (where oxygen is absorbed either through gills or thin areas of the epidermis) to the animal’s interior (where oxygen can not just simply diffuse—recall oxygen only diffuses a distance of 0.5 mm.) The circulatory system is a major player in moving oxygen to the internal tissues. There will be three dissections in this lab which will allow you to see some of this complexity. The intent of the dissections is to help you to begin developing the ability to recognize internal structures and to make comparisons between phyla and even between classes (as you will be doing for the mollusc dissections.) The dissections will be done by your lab instructor but you are welcome to do a dissection if you wish—provided we have enough material. These three dissections will more than likely show up on the lab final and will be discussed in more detail below.
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  • Fall '09
  • SchwartzandKeen
  • Annelid, complete gut, Hirudinea, different body forms, Lab 6—Phyla Annelida, annelid skeletal structure

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