Insects and Their Relatives Section 30.3. Insect diversity The largest group of animals Four...
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Transcript of Insects and Their Relatives Section 30.3. Insect diversity The largest group of animals Four...
Insects and Their Relatives
Section 30.3
Insect diversity
The largest group of animals Four important orders:
Coleoptera – ‘shield-winged’ like beetlesDiptera – ‘two-winged’ like fliesLepidoptera – ‘scale-winged’ like butterfliesHymenoptera – ‘membrane-winged’ like
wasps
Coleoptera
Green bottle fly
Butterflies
Ants
Insect Body Plan
1. Head – has mandibles, specialized mouthparts, one pair of antennae and usually 1 pair of compound eyes
2. Thorax – has three pairs of jointed walking legs; some without wings, others with 1 or 2 pairs of wings
3. Abdomen – has 9 – 11 segments
Insect body parts
Insect Life Cycle
Complete metamorphosis: Almost all insect species egg larva pupa in chrysalis adult Incomplete metamorphosis: egg nymph (several molts) adult
Insect Life Styles
Flight: Insects were the first animals to develop flight Wings develop from sacs of the body wall of the
thorax Most insects can fold their wings over the
abdomen – some cannot Social insects: Ants, bees, wasps, and termites Division of labor within the colony
Many insects can fly
Ants are social insects
Insect relatives
Centipedes –1 pair of legs per segment; carnivores
Millipedes – 2 pair of legs per segment; herbivores
Centipedes – 1 pair of legs/segment
Millipedes – 2 pairs of legs/segment