Announcements - Sonoma State University · Announcements Lab Quiz on Monday. ... Excretory Nervous system Digestive system Sensory organs ... A.Cockroach B.Honeybee

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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