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08InsectPhysI - • invaginations of epidermis continuous...

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1 Announcements Lab Quiz on Monday. Covers labs until this week. I will not test you on biological keys to order and family. Final segments of abdomen Segments 8 & 9- genitalia appendages – Female • Gonopore on segment 8 Structures for copulation – Male • Copulatory organ called aedeagus May function in clasping and sperm transfer Segment 10- no appendages Segment 11- cerci Ovipositor Modifications
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2 Variation in abdomenal appendages Internal Anatomy and Physiology Nervous system Excretory Sensory organs Digestive system Musculature Tracheal system Reproductive system Circulatory system Endocrine system Body cavity Body Cavities True coelom- reduced to surrounding reproductive and excretory organs Hemocoel Contains circulatory system Bathes internal organs in blood Distributes nutrients
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3 Tracheal System Take in oxygen, release gas wastes Lining continuous with cuticle • Branched Tracheae invaginations of
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Unformatted text preview: • invaginations of epidermis continuous with cuticle • shed with exoskeleton • rings flexible yet resist compression • branch out to small tracheoles • air reaches respiring tissues Tracheal system • Spiracles open into trachea • ‘ valve ’ at opening 4 Evolutionary flexibility in tracheal system Open in terrestrial environments A. Cockroach B. Honeybee C. Mosquito larva Closed in aquatic environments D. Parasitoid E. Mayfly larva F. Dragonfly larva Circulation • Open circulatory system • Hemolymph – Plasma: • Water reservoir • Chemical exchange – Hematocytes • Immune response • Coagulation • Nutrient storage and distribution Circulation- dorsal heart – In pericardial sinus – Muscular vessel enclosed by body wall and diaphragm – Valves prevent backflow – Pumps push blood from posterior towards head...
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