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Introduction to Insects

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Outline

• Insects and their relatives

• How insects rule the world

•

Insect anatomy and biology

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Insects and their relatives

• Arthropods are numerous and diverse

 – Insects (beetles, fies, moths, earwigs, aphids)

 – Arachnids (spiders, ticks, mites, scorpions)

 – Crustaceans (craysh, crabs, lobsters, sowbugs)

 – Centipedes, millipedes

• !oskeleton is a hard outer shell

•  "ointed appendages, segmented body• Not arthropods# slugs, snails, earthworms

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Basic insect body plan

Head

Thorax

Abdomen

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Basic insect body plan

HeadThorax

Abdomen

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Basic arachnid body plan

Cephalothorax

Abdomen

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Basic arachnid bodyplan

Cephalothorax

Abdomen

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Insects

• 3 bodyregions

• 1 pair ofantennae

• 3 pair of legs

• pair of

Arachnids

• bodyregions

• "oantennae

• # pair of

legs•

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Insects rule the !orld$

•  $here are more

insects than all

other plants and

animals combined

•  $here are more than

% million di&erentspecies

• % out o' every

animals is a beetle

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•

*mall si+e• ultigenerational

• -light

•

etamorphosis• .ide variety in

'ood choices

• .ide variety in

habitat resources

%hy are insects sosuccessful&

' (arlin )* +ice

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Insect metamorphosis

Completemetamorphosis, egg-larva- pupa- adult

e*g*- beetles-

Incompletemetamorphosis, egg-nymph- adult

e*g*- grasshoppers-Images from Cornell University, Http://nides.bc.ca/Assignments/Insects/Metamorphosis3.htm

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Insects eat everything

• Carnivore, animal matter

• Herbivore, plant matter

• /mnivore, plant and animal matter

• 0etrivore, organic matter

• *aprophore, decaying matter

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Are these insects&

' (arlin )* +ice

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Ho! to I/ insects, !ings

beetle

!asp butter.y .y

ear!iggrasshopper

true bug

. !esse

. !esse. !esse

' (arlin )* +ice ' (arlin )* +ice

' (arlin )* +ice

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Che!ing,grasshoppers-beetles-

praying

0iercing

suc2ing,mosuitoes-

true bugs

4iphoning,

butter.ies-moths

4pongin

g, house.y

Ho! to I/ insects,mouthparts

Images on this page from ". #essin, University of $ent%c&y

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Ho! to I/ insects,antennae

freenat%repict%res.com

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Ho! to I/ insects, legs

!al2ing

grasping

pollencarrying

digging  5umping

s!immingandgrasping

. !esse. !esse

' Marlin (. "ice

)a%

lM.Choate,Universit y

of*lorida

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4ummary

•

There are many keys to help in the accurateidentification of insects

• Wings, antennae, legs, mouthparts

' Marlin (. "ice