Artropods_part_1 - Coelomate Invertebrates Arthropods Part...

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Coelomate Invertebrates Arthropods Part 1
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Jointed Appendages and Exoskeleton • All arthropods have jointed appendages. • Rigid external skeleton (exoskeleton) – protects animal and provides sites for muscle attachment • brittle, thus arthropod body size limited due to exoskeleton thickness – estimates of a quintillion insects alive at any one time (Most diverse phylum) • 1,000,000 species
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Beetles 36.2% Flies 12.1% Butterflies, Moths 12.1% Bees, wasps 10.3% Other Insects 8.6% Crustaceans 3.4% Spiders 5.2% Other Arthropods 12.1%
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Insects eliminate wastes by collecting circulatory fluid osmotically in Malpighian tubules that extend from the gut into the blood and then reabsorbing the fluid, but not the wastes. Insects have complex sensory organs located on the head, including a single pair of antennae and compound eyes composed of many independent visual units. Insects breathe through small tubes called tracheae that pass throughout the body and are connected to the outside by special openings called spiracles. The jointed appendages of insects may be modified into antennae, mouthparts, or legs. Attached to the central body region, the thorax, there are three pairs of legs and, most often, two pairs of
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Artropods_part_1 - Coelomate Invertebrates Arthropods Part...

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