3454chapter18 - Arthropoda (Trilobita, Chelicerata), Ch. 18...

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Arthropoda (Trilobita, Chelicerata), Ch. 18 Phylum Arthropoda—“joint-foot”, spiders, crustaceans, insects, centipedes, etc. Almost 1,000,000 recorded species, many more yet to be discovered, largest phylum why so successful? 1. versatile exoskeleton 2. segmentation and appendages for locomotion 3. e cient tracheal system 4. highly developed sensory organs 5. complex behavior patterns 6. metamorphosis -- limits intraspecific competition Eucoelomate, triploblastic, dioecious, protostomous, bilateral symmetry
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Coelom reduced with lessened hydrostatic function due to exoskeleton Reduced to spaces around heart and gonads Metameric segmentation with a tendency towards tagmatization (fused segments) All modes of heterotroph, all types of environment occupied Chitinous exoskeleton or cuticle—thin epicuticle and thicker procuticle Protein and chitin matrix, some with impregnated calcium salts Tough, flexible, water and alkali/acid resistant Thin hinges of cuticle at joints, cuticle shed through ecdysis as animal grows Limbs or modified limbs on each metamere (reduced or lost on some in some groups)
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Modified for sensory function, feeding, grasping, swimming, burrowing, etc. Tracheal system that pumps air to tissues, may have
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This note was uploaded on 11/29/2009 for the course BIOL 3454 taught by Professor Lab during the Spring '08 term at UT Arlington.

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3454chapter18 - Arthropoda (Trilobita, Chelicerata), Ch. 18...

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