power3 - 1 How did insects become the dominant...

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1 1 How did insects become the dominant invertebrates in the terrestrial environment? • Flight • Diverse feeding habits Small size rapid reproduction • Small size, rapid reproduction • Co-evolution with plants • Over a million species known, and still counting; the majority associated with flowering plants 2 Where did insect wings come from? • Insect wings developed from the exoskeleton on the back of the animal or from gill appendages in their aquatic ancestors Are insect wings homologous with bird or bat wings? With some 500,000 species, beetles constitute the largest order of living things on Earth 3 Social insects may form massive colonies with specialized individuals • Termites (right) belong to the order Isoptera Bees, wasps and ants 4 Bees, wasps and ants belong to the order Hymenoptera Source: Flickr 5 Insects are characterized by: 3 pairs of jointed appendages A body divided into head, thorax and abdomen Mouthparts derived from a pair of mandibles
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power3 - 1 How did insects become the dominant...

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