2 Insect Evolution

2 Insect Evolution - 1 Insect Evolution 1 Fossil...

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Unformatted text preview: 1 Insect Evolution 1 Fossil photographs with permission by David Kohls. Accessed online Sept 2009. http://paleobiology.si.edu/greenRiver/insectPhotos.html . Objectives • Describe the four successive stages of insect evolution. • Define ametabolous, hemimetabolous and holometabolous, and the similar terms regarding wing development. • Describe the theories of insect wing evolution. 2 Newly molted Odonate alongside its larval skin. Introduction Beetle fossil You may wonder, "What kinds of fossils could entomologists find that might show them how insects gradually evolved?” Also, “How can insect fossils be found? Insects are so tiny!" 3 Beetle fossil Hemipteran fossil Believe it or not, there are insect fossils-- quite a few of them. http://paleobiology.si.edu/greenRiver/inse ctPhotos.html (Click to view slide show of fossil insects.) Fossil Record ERA PERIOD APPROXIMATE TIME BOUNDARIES LIFE FORMS ORIGINATING MESOZOIC 136,000,000 Primates – Flowering Plants 195,000,000 Birds 225,000,000 Dinosaurs-Mammals 280,000,000 CARBONIFEROUS 320,000,000 Reptiles PALEOZOIC 345,000,000 Fern Forests 395 000 000 Amphibians Insects 4 395,000,000 Amphibians - Insects 430,000,000 Vascular Land Plants 500,000,000 Fish - Cordates 570,000,000 Shel fish - Trilobites Read textbook pages 202-208 to discover more about the antiquity of insects. ERA PERIOD APPROXIMATE TIME BOUNDARIES LIFE FORMS ORIGINATING 10,000 Q UARTERNARY 2,500,000 Human Beings CENOZOIC 12,000,000 T ERTIARY 26,000,000 Grazing and 38,000,000 Carnivorous 54,000,000 Mammals 65,000,000 MESOZOIC 136,000,000 Primates – Flowering Plants 195,000,000 Birds Fossil Record 5 225,000,000 Dinosaurs-Mammals 280,000,000 C ARBONIFEROUS 320,000,000 Reptiles PALEOZOIC 345,000,000 Fern Forests 395,000,000 Amphibians - Insects 430,000,000 Vascular Land Plants 500,000,000 Fish - Cordates 570,000,000 Shel fish - Trilobites PRECAMBRIAN 700,000,000 1,500,000,000 3,500,000,000 4,650,000,000 Formation of Earth Metamorphosis Terms Metamorphosis 1. ametabolous 2. hemimetabolous 3. holometabolous 1 st molt...
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