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Introduction to Insects. Insects and their relatives How insects rule the world Insect anatomy and biology. Outline. Arthropods are numerous and diverse Insects (beetles, flies, moths, earwigs, aphids) Arachnids (spiders, ticks, mites, scorpions)

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Introduction to Insects

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Introduction to insects

Introduction to Insects


Outline

Insects and their relatives

How insects rule the world

Insect anatomy and biology

Outline


Insects and their relatives

Arthropods are numerous and diverse

Insects (beetles, flies, moths, earwigs, aphids)

Arachnids (spiders, ticks, mites, scorpions)

Crustaceans (crayfish, crabs, lobsters, sowbugs)

Centipedes, millipedes

Exoskeleton is a hard outer shell

Jointed appendages, segmented body

Not arthropods: slugs, snails, earthworms

Insects and their relatives


Introduction to insects

Basic insect body plan

Head

Thorax

Abdomen


Basic insect body plan

Basic insect body plan

Abdomen

Thorax

Head


Introduction to insects

Cephalothorax

Abdomen

Basic arachnid body plan


Basic arachnid body plan

Basic arachnid body plan

Abdomen

Cephalothorax


Introduction to insects

  • Insects

  • 3 body regions

  • 1 pair of antennae

  • 3 pair of legs

  • 2 pair of wings

  • Arachnids

  • 2 body regions

  • No antennae

  • 4 pair of legs

  • No wings


Insects rule the world

There are more insects than all other plants and animals combined

There are more than 1 million different species

1 out of every 5 animals is a beetle!

Insects rule the world!


Introduction to insects

Why are insects so successful?

Small size

Multigenerational

Flight

Metamorphosis

Wide variety in food choices

Wide variety in habitat resources

© Marlin E. Rice


Insect metamorphosis

Insect metamorphosis

Incomplete metamorphosis: egg, nymph, adult

e.g., grasshoppers, true bugs

Complete metamorphosis: egg, larva, pupa, adult

e.g., beetles, butterflies, flies

Images from Cornell University, Http://nides.bc.ca/Assignments/Insects/Metamorphosis3.htm


Insects eat everything

Carnivore, animal matter

Herbivore, plant matter

Omnivore, plant and animal matter

Detrivore, organic matter

Saprophore, decaying matter

Insects eat everything


Are these insects

Are these insects?

© Marlin E. Rice


How to id insects wings

How to ID insects: wings

beetle

true bug

grasshopper

earwig

© Marlin E. Rice

© Marlin E. Rice

L. Jesse

wasp

butterfly

fly

L. Jesse

L. Jesse

© Marlin E. Rice


Introduction to insects

How to ID insects: mouthparts

Siphoning: butterflies, moths

Piercing-sucking: mosquitoes, true bugs

Sponging: house fly

Chewing: grasshoppers, beetles, praying mantis

Images on this page from R. Bessin, University of Kentucky


How to id insects antennae

How to ID insects: antennae

freenaturepictures.com


How to id insects legs

How to ID insects: legs

grasping

pollen-carrying

walking

L. Jesse

L. Jesse

swimming and grasping

digging

jumping

Paul M. Choate, University of Florida

© Marlin E. Rice


Introduction to insects

Summary

  • There are many keys to help in the accurate identification of insects

  • Wings, antennae, legs, mouthparts

© Marlin E. Rice


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