Entomology

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Entomology
Modified by Georgia Agricultural Education
Curriculum Office July 2002
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Entomology

• What is Entomology?
• Entomology is the study of insects. Insects are
  always around us. Scientists called entomologist
  spend most of their time studying insects.

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Entomology

• What is the average amount of insects that are on
  the earths surface?
• More than 750,000 species of insects have been
  identified.

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Entomology

• Are all insects harmful to humans?
• No. Only about 10,000 are harmful to humans.

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Entomology

• Classification of insects
• Different levels of classifying insects
• Kingdom
• Phyla
• Class
• Order
• Family
• Genus
• Species

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Entomology

• The highest classification level is the kingdom.
• The most specific classification is the species
  level.
• Organisms are classified by genus and species.
• This is called a binomial nomenclature.

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Entomology

• Six orders of insects
• Orthoptera - grasshopper and locust
• Hemiptera -leaf hoppers and plant bugs
• Lepidoptera moths and butterflies
• Homoptera - aphids

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Entomology

• Cont
• Thysanoptera - thrips
• Coleoptera - beetles (the largest group of the
  insect orders)

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Entomology

• How are insects grouped?
• Insects are grouped by their mouth parts.

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Entomology

• Six different mouth parts
• Sponging
• Rasping- sucking
• Siphoning
• Chewing-lapping
• Chewing
• Piercing- sucking

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Entomology

• Insects have no internal skeleton. They rely on
  a hard outer coating called exoskeleton to
  protect the inner organs and support the body.

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Entomology

• What are the parts of an insect?
• Three parts to an insect
• Head
• Thorax
• Abdomen

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Entomology

• Head
• The head has a pair of compound eyes and two
  sensory appendages called antennae.

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Entomology

• Thorax
• The thorax is divided into three segments. Three
  pairs of legs are attached to the thorax.

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Entomology

• Abdomen
• The abdomen is attached to the thorax.

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Entomology

• Insects will complete one of three different life
  cycles.
• No Metamorphosis - no change
• Incomplete Metamorphosis - gradual change
• Complete Metamorphosis - complete change

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Entomology

• Incomplete Metamorphosis
• Egg
• Early nymph (no wings)
• Late nymph (wings developing)
• Adult

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Entomology

• Complete Metamorphosis
• Egg
• Larva
• Pupa
• Adult

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Entomology

• What is a larva?
• A larva is a young insect with a soft tubular
  body and looks very much like a worm.

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Entomology

• What is a pupa?
• The pupa stage is a dormant stage where the larva
  changes into an adult.

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Entomology

• What are Phytophagous insects?
• Phyto means plant and phagous means eating.
  Whenever a plant is eaten, it is damaged in terms
  of growth and productivity.