Insects

Classification of Insects

• Kingdom Animalia– Invertebrates

• Phylum Arthropoda– Exoskeleton

– Jointed legs

• Class Centipedes Class Millipedes

Class Crustaceans

Class Arachnids

Class Insecta Characterisitics

• 3 body parts

• Six legs

Class Insecta Characteristics

• Two pairs of wings

• Two kinds of eyes– compound

Class Insecta Characteristics• Two Antennae

• Two sets of jaws

Class Insecta Characteristics

• All insects begin their life cycle as an egg.

Insect Orders

Insects place in the Animal Kingdom

• 1 million species identified (Most populous of all living things)

• Most diverse of

all organisms

Insects place in the Animal Kingdom

• Can live in any environment• Well adapted to their environment

– camouflage

Harmful Insects • Destroy Crops

• Carry/Spread Diseases

Parasitic

Helpful InsectsFood for other organisms

Pollinate flowers to produce fruits and vegetables

Helpful Insects

Eat other harmful insects

Help in decay of dead organisms

True Bugs

Order Hemiptera

Long feeding tubes

All bugs are insects but not all insects are bugs

Exoskeleton

• A hard outer covering

• Used for protection

• Made of chitin

Insect Head – Eyes, mouthparts, antennae

Insect Thorax – legs, wings

Insect Abdomen – digestive and reproductive organs

Insect Antennae (Feelers)

• Sensory Organs– Touch– Taste– Smell– Hearing

Insect Mouthparts

Sponging/Lapping

Ex. housefly

Siphoning/Proboscis

Ex. butterfly

Insect Mouthparts Piercing/Sucking

Ex. Wheel bug and Mosquito

Chewing

Ex. caterpillars

None

Ex. mayfly

Insect Wings

Membranous

Clear with veins showing

Hard shell like outer wings

Powdery Scales

Insect Life cycles

• Simple Metamorphosis

hatches from egg looking just like the adult

grows in size by molting

Insect Life Cycles• Incomplete Metamorphosis

– Hatches from egg and becomes a nymph– Nymph does not have fully developed wings– Molts to become an adult

Insect Life Cycles• Complete Metamorphosis

– Egg

– Larva (Caterpillar)

– Pupa (Chrysalis or Cocoon

– Adult