Lecture_3_-_Animal_Architecture_Protozoa_-_150911

Lecture_3_-_Animal_Architecture_Protozoa_-_150911 -...

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Unformatted text preview: 9/15/2011 1 Animal Architecture Animal Diversity 5 th Ed. Chapter 3, Pages 55 - 71 4 th Ed. Chapter 3, Pages 53 - 71 1. Levels of Organization 2. Organ Systems & Extracellular Components 3. Tissue Types 4. Body Plans c c c Lecture 3 (part 1) - OUTLINE BIOL 2030 Lecture 3 Slide 1 BODY PLANS 1. External Architecture - Symmetry (i) Asymmetry- no body axis and no plane of symmetry Poriferans (sponges) Protozoans (amoeba)- regular arrangement of body structures relative to axis of the body- animals that can be bisected along at least one plane BIOL 2030 Lecture 3 Slide 2 9/15/2011 2- infinite number of planes of symmetry (ii) Spherical symmetry- rare, found only in protozoans Protozoans (radiolarians)- these organisms lack polarity (i.e. no differentiation along an axis) - body lacks an axis (spherical form) BODY PLANS 1. External Architecture - Symmetry BIOL 2030 Lecture 3 Slide 3- divided equally by more than two planes passing through the longitudinal axis (iii) Radial symmetry- rare e.g. polyps, some sponges- most forms are modified (multiradiality) (e.g. biradial, quadriradial, pentaradial) body axis- body has the general form of a cylinder- one main axis around which body parts are radially arranged BODY PLANS 1. External Architecture - Symmetry BIOL 2030 Lecture 3 Slide 4 9/15/2011 3- division along the midsaggital plane results in two equal halves (iii) Bilateral symmetry- controlled mobility, anterior of animal confronts environment first- associated with cephalization- body parts oriented about a single anterior to posterior axis anterior posterior- surfaces differentiate as dorsal (protection) and ventral (locomotion) BODY PLANS 1. External Architecture - Symmetry BIOL 2030 Lecture 3 Slide 5 BODY PLANS Protozoa Ancestral Metazoan Cnidarians Sponges Flatworms Nemerteans Nematodes Gastrotrichs Rotifers Arthropods...
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Lecture_3_-_Animal_Architecture_Protozoa_-_150911 -...

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