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Insect Biology Topic 2042 Aaron Gearhart. Biology of Insects This lecture will go over the following topics Insect Body –Head –Thorax –abdomen Insect.

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Presentation on theme: "Insect Biology Topic 2042 Aaron Gearhart. Biology of Insects This lecture will go over the following topics Insect Body –Head –Thorax –abdomen Insect."— Presentation transcript:

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 http://www.ent.iastate.edu/list/images.html

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 www.earthlife.net/insects/six.html

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 http://www.ent.iastate.edu/list/images.html

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. http://www.denniskunkel.com/PublicHtml/WANTED/BODIES/IndexBodies.html

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 http://www.life.uiuc.edu/Entomology/insectgifs/thysanura.gif

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 http://www.ent.iastate.edu/

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 http://stephenville.tamu.edu/~fmitchel/dragonfly/photo/cw_aes1.htm

12 Complete metamorphosis Goes through four distinct stages –Egg –Larvae –Pupa –Adult http://www.geocities.com/pchew_brisbane/wanderer.htm

13 Questions or Comments? http://www.ent.iastate.edu/list/images.html


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