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Announcements

Field trip to Pepperwood this Sunday.Meet at SSU at 9:00 am.Will last until 4:30 or so, bringsack lunch and water if interested

Exam on MondayWill cover material since firstlecture

Emphasis on topics and termscovered in lecture and study guide

Legs

Legs

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Pretarsus

Leg Adaptations

Leg Adaptations

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Leg Adaptations

Legs

wings• Usually fully developed only in adult• Flap-like projections of cuticle with tubular, sclerotized

veins• Primitively 2 wings to metathorax and two to mesothorax• Hindwings

– Tend to be smaller– Sometimes only functional wings

• Modified in flies to halteres

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Wings

Supported by tubularveins with tracheae,blood vessels, nervefibers

• Groundplan of six veins– Anterior

• Costa- never branches• Subcosta- branches sometimes into two

– Radius– Media– Cubitus– Anal

• Cells are areas defined by veins– Open- extend to margin– Closed- surrounded by veins

• Veination often genus or species specific

Wings

Wings

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Variation in wing morphology

Membranous wings

Orthoptera

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Coleoptera

Hemiptera

Lepidoptera

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Abdomen• Least tagmatized body region• Large and conspicuous spiracles• First seven segments progenital

Primitive condition has appendages

Left: aquatic insectRight: ancient vs modern insect