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Bio Lab Wksht & HW Questions 85

Bio Lab Wksht & HW Questions 85 - and Phylum...

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80 KINGDOM ANIMALIA Part 2: “Armoured” Invertebrates A. Introduction: You will survey the remaining protostomic Lophotrochozoan phylum (the Mollusca), survey the Ecdysozoa, and dissect the grasshopper, Romalea microptera in today’s exercise. All of the invertebrates seen in today’s lab possess some type of tough body covering or “armour”. To prepare for this lab, you should read Chapter 33, pp. 656-665 of Campbell and Reece (2005). Laboratory Objectives: Following the completion of this exercise, you should be able to: Describe the features of protostomes Recognize and classify (into phyla, subphyla, and classes, where appropriate) the organisms viewed based on diagnostic and other characters. Identify the external and internal features of the grasshopper, and indicate their functions. B. Survey of the Protostomia : LOPHOTROCHOZOA: (Continued - Phylum Platyhelminthes, Phylum Rotifera,
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Unformatted text preview: and Phylum Annelida were examined in Part 1 of Kingdom Animalia). Phylum Mollusca Molluscs are bilateral, eucoelomate protostomes which lack segmentation, and have bodies composed of a muscular foot (used for locomotion or food capture), visceral mass (which contains the organ systems), mantle ( a soft tissue that secretes the shell) mantle cavity (where gills and excretory organs are located), and calcareous shell . Most species are marine and possess a radula (a rasping organ in the mouth used to scrape up food). Class Polyplacophora (chitons) Primitive marine molluscs with typically 8 overlapping shell plates along the dorsal midline. Note how the foot is used as a suction cup to adhere to rocks. Chitons feed by using their radula to scrape algae from the surface of rocks. The mantle cavity is a groove between the foot and the edge of the mantle. Find the gills in this groove....
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