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Insect Biology Topic 2042 Aaron Gearhart.

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1 Insect Biology Topic 2042 Aaron Gearhart

2 Biology of Insects This lecture will go over the following topics
Insect Body Head Thorax abdomen Insect Life Cycles No metamorphosis Gradual metamorphosis Incomplete metamorphosis Complete metamorphosis

3 Body of an Insect Divided into three parts
Head Thorax Abdomen Segmentation allows for efficiency since each segment is specialized for a different function

4 The Head Contains the following parts Eyes – Simple or Compound
Anennae – used for smelling or feeling Mouthparts – for sucking or chewing

5 Mouthparts Almost infinite variations
Mouthparts are often used to determine type of control that will be most effective for a specific insect Examples: Fly: has a sponge type mouth Assasin bug: Has a spear or needle type mouth Grasshopper: Has a chewing mouth Some butterflys: Have a long “hose” for sucking nectar

6 Thorax The locomotive segment of an insect Contains wings and legs
Of course insects have three pairs of legs for a total of….6 Insects may have 0 wings: ants, lice, mites 1 pair of wings: flys, true bugs 2 pairs of wings: wasps, bees

7 Abdomen Contains the following
Digestive organs Reproductive organs Respiratory organs Excretory organs Abdomen can change shape depending on how much it ate or if it has eggs.

8 Lifecycles of the Insect
No metamorphosis Gradual metamorphosis Incomplete metamorphosis Complete metamorphosis

9 No Metamorphosis These insects emerge from the eggs looking exactly like the adult but smaller Primitive insects like the silverfish are examples of this Also known as ametabolous

10 Gradual Metamorphosis
Similar to no metamorphosis but the youngster coming out of the egg is slightly different from the adult Examples are grasshoppers and crickets

11 Incomplete metamorphosis
These insects change from egg -> nymph -> adult After their last molt these insects rapidly change to adult Some examples would be dragonflies Also termed hemimetabolous

12 Complete metamorphosis
Goes through four distinct stages Egg Larvae Pupa Adult

13 Questions or Comments?

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