anatomyHO - have cutting teeth to get plant material and...

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ESPM 40: Insect Biodiversity Key questions: 1. How do insects differ from vertebrates? 2. What are the main components of the exoskeleton? What is sclerotization? 3. What are the benefits and detriments to having an exoskeleton? 4. Name the different kinds of insect mouthparts and describe how they are used. 5. Discuss the major types of insect legs and how they are used. Insects are upside down. They have a ventral nerve cord and a dorsal heart. Vertebrates have a dorsal nerve cord and the heart is located more ventrally. Insects are inside out. They possess a hard outer covering, known as an exoskeleton. Vertebrates have an internal skeleton. Insects have an open circulatory system. Insects breathe with tubes. Main body regions: Head: brain, mouthparts, eyes Thorax: legs and wings Abdomen: sexual organs Insect mouthparts Mandibulate: chewing mouthparts o thought to be the ancestral condition – all other types of mouthparts are derived from a basic chewing ancestor o predators have sharp teeth for catching an impaling prey, grazers
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Unformatted text preview: have cutting teeth to get plant material and grinding teeth for chewing leaves Haustellate mouthparts (sucking mouthparts) o can be piercing or non-piercing o has evolved multiple times in various ways within insects Appendages All insect appendages are derived from specialized sacs of cells known as imaginal discs. The leg disc telescopes out, with the more central regions forming the more distal parts (parts of the structure furthest from the body) and those on the outside of the disc forming the more basal parts (parts of the structure closest to the body). Leg Modifications Ambulatory: walking Raptorial: catching prey Fossorial: digging Natatorial: swimming Saltatorial: jumping Terms to know: sclerotization, exoskeleton, epidermis, epicuticle, endocuticle, exocuticle, mandibulate, haustellate, analogy, homology, convergent evolution, imaginal disc, ambulatory, cursorial, fossorial, saltatorial, natatorial, raptorial,...
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anatomyHO - have cutting teeth to get plant material and...

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