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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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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


Basic insect body plan

Head

Thorax

Abdomen


Basic insect body plan
Basic insect body plan

Abdomen

Thorax

Head


Cephalothorax

Abdomen

Basic arachnid body plan


Basic arachnid body plan
Basic arachnid body plan

Abdomen

Cephalothorax


  • 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!


Why are insects so successful? combined

Small size

Multigenerational

Flight

Metamorphosis

Wide variety in food choices

Wide variety in habitat resources

© Marlin E. Rice


Insect metamorphosis
Insect metamorphosis combined

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 combined

Herbivore, plant matter

Omnivore, plant and animal matter

Detrivore, organic matter

Saprophore, decaying matter

Insects eat everything


Are these insects
Are these insects? combined

© Marlin E. Rice


How to id insects wings
How to ID insects: wings combined

beetle

true bug

grasshopper

earwig

© Marlin E. Rice

© Marlin E. Rice

L. Jesse

wasp

butterfly

fly

L. Jesse

L. Jesse

© Marlin E. Rice


How to ID insects: mouthparts combined

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 combined

freenaturepictures.com


How to id insects legs
How to ID insects: legs combined

grasping

pollen-carrying

walking

L. Jesse

L. Jesse

swimming and grasping

digging

jumping

Paul M. Choate, University of Florida

© Marlin E. Rice


Summary combined

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

  • Wings, antennae, legs, mouthparts

© Marlin E. Rice


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