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insectbiodivHO - Two pairs of antennae Appendages on most...

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ESPM 40: Insect Biodiversity Key questions: 1. Why are insects so diverse? What are the major ways that insects obtain their nutrition? 2. How do insects have an impact on conservation management? Agriculture? Homes and businesses? Human disease? 3. What is taxonomy? What is phylogeny? How do they differ? 4. What are the most important differences that distinguish insects from other Arthropod classes? 5. Name three orders of insects and be able to discuss the characters that define them. Phylum Arthropoda - jointed (segmented) exoskeleton 1. Bilaterally symmetrical 2. Segmented 3. Open circulatory system 4. Exoskeleton 5. Ventral Nerve cord 6. Dorsal Artery 1. Trilobita (Fossil species only) 2. Chelicerata (chelicerae for mouthparts) Arachnida (spiders, scorpions, ticks, mites, etc.) 3. Myriapoda - have head and many segments (centipedes, millipedes) 4. Crustacea (e.g., crabs, shrimp, pill bugs) Two pairs of antennae
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Unformatted text preview: Two pairs of antennae Appendages on most segments, mostly marine or freshwater aquatic; use gills, so require moisture or high humidity to live 5. Hexapoda: includes primitive groups of insect-like taxa and the true insects. They differ from other arthropods via embryonic development (meroblastic vs. holoblastic) and several other characters. All primitive groups are apterous (lack wings). Insecta (“true” insects). - 1 pair of antennae - 3 Major body regions - result from tagmosis (grouping into a functional unit) of segments- Head; Thorax; Abdomen - 3 pairs of walking legs - most have wings To see excellent photographs of insects in the major insect orders, go to http://www.insects.org/entophiles/index.html and for even more information http://tolweb.org/tree?group=Hexapoda&contgroup=Arthropoda Definitions: Tagma (tagmosis), characters, apterous, arthropoda, insecta, arachnda, myriapoda, crustacea,...
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