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Bio Lab Wksht & HW Questions 95

Bio Lab Wksht & HW Questions 95 - mouth is a new...

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90 KINGDOM ANIMALIA Part 3: Deuterostomes A. Introduction: In this exercise, you will examine representatives of the deuterostome phyla (and classes of the phyla Echinodermata and Chordata), learn their important characteristics and dissect a sea star. Chapters 33 (pp. 665- 668) and 34 (pp. 671-700) of Campbell and Reece (2005) serve as reference for today’s lab. Laboratory Objectives: After completing today’s exercise, you should be able to: Distinguish between protostomes and deuterostomes. Recognize and classify the organisms viewed today to phylum, subphylum, and class, where appropriate, based on diagnostic and other features. Identify the external and internal structures of the sea star and indicate their functions. B. Survey of the Deuterostome Phyla: DEUTEROSTOMIA These animals show characteristic embryology: radial, indeterminate cleavage, mesoderm and coelom formation by means of enterocoelic pouches, and the blastopore forming the anus (the
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Unformatted text preview: mouth is a new second opening). Phylum Echinodermata: Members of this phylum are secondarily radially symmetrical eucoelomate deuterostomes which develop from bilateral larvae. The echinoderms are all marine, have calcareous endoskeletons, and display respiratory/locomotory/feeding appendages called tube feet ( podia ). We will examine four echinoderm classes. Class Asteroidea (sea stars, sea star) Generally flattened echinoderms with central disk not sharply delineated from arms; arms having open ambulacral grooves; carnivores or scavengers. Can you see suction disks on the tube feet? Do any of the specimens show regeneration of arms? Class Ophiuroidea (brittle stars) Generally flattened echinoderms with central disk sharply delineated from arms; arms with closed ambulacral grooves; scavengers or filter feeders. How do these organisms differ from members of the Class Asteroidea?...
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