BIO 100 Invertebrates PowerPoint.ppt - Kingdom Animalia Animal Features 1 Multicellular eukaryotes with ingestive nutrition 2 Lack cell walls 3 Most are

BIO 100 Invertebrates PowerPoint.ppt - Kingdom Animalia...

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Kingdom Kingdom Animalia Animalia
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Animal Features 1) Multicellular eukaryotes with ingestive nutrition. 2) Lack cell walls. 3) Most are motile. Four other “special features,” used to classify groups of animals. 4) Symmetry, 5) Cephalization, 6) Body Plan, 7) Development
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Special Features 4) Symmetry: how parts of a body relate to others. Plane of symmetry: plane that divides a body into two mirror image halves. a) Asymmetry: No planes of symmetry, e.g., Porifera. b) Radial symmetry: Multiple planes of symmetry, e.g., Cnidaria. Advantage: equally able to receive food from any direction, good for sessile forms. c) Bilateral symmetry: One plane of symmetry, e.g., Arthropoda, most animals. Advantage: bilateral symmetry, rapid response to stimuli.
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Radial Symmetry Bilateral Symmetry
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5) Cephalization -the evolutionary development of a head by the anterior aggregation of sense organs and nervous tissue used in decision making (the brain). -An adaptation for moving through the environment that provides rapid response to diverse stimuli. -Closely related to bilateral symmetry.
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6) Body plan -Gut a) Sac-like (incomplete digestive tract): mouth=anus b) Tube-like (complete digestive tract): separate mouth and anus, regionalization.
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6) Body Plan Continued -Body Cavity a) No body cavity - have tissues and organs packed between gut and body wall .
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epidermis gut cavity organs packed between gut and body wall No coelom (acoelomate animals)
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b.) False body cavity -body cavity is only partially lined.
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epidermis gut cavity unlined body cavity around gut Pseudocoel (pseudocoelomate animals) b) false body cavity --Main body cavity is only partially lined
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c) True body cavity - have a cavity where the organs are held. -allows organs to be cushioned in fluid, and to move, grow and develop independently of the body wall -cavity is located between the gut and the body wall and has a lining.
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epidermis gut cavity peritoneum body cavity with lining that holds internal organs in place Coelom ( coelomate animals)
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6) Body Plan Continued -Segmentation=repeating series of body units a) non-segmented, e.g., nematode b) similar segments, e.g., earthworm c) differing segments, e.g., insect
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7) Development a) Sequence
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