announcements - sonoma state university · announcements lab quiz on monday. ... excretory nervous...
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Announcements
Lab Quiz on Monday.Covers labs until this week. I willnot test you on biological keys toorder 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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Variation in abdomenal appendages
Internal Anatomy and Physiology
Nervous systemExcretorySensory organsDigestive systemMusculatureTracheal systemReproductive systemCirculatory systemEndocrine systemBody 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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Tracheal System
• Take in oxygen,release gas wastes
• Lining continuouswith cuticle
• Branched
Tracheae
• invaginations ofepidermis continuouswith 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
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Evolutionary flexibility in tracheal system
Open in terrestrial environmentsA. CockroachB. HoneybeeC. Mosquito larva
Closed in aquatic environmentsD. ParasitoidE. Mayfly larvaF. 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 bodywall anddiaphragm
– Valves preventbackflow
– Pumps pushblood fromposterior towardshead