The Invertebrates Chapter 12 F Arthropods Arthropods Arthropoda
The Invertebrates Chapter 12 F Arthropods
Arthropods • Arthropoda – Most species of any animal phylum – Insects are the largest class – Have exoskeletons and jointed appendages
Exoskeleton A hard, nonliving outer covering that supports and protects the animal
Major Groups of Arthropods Class Insecta Characteristics Example 3 body sections 3 pairs of legs 2 pairs of wings (usually) Freshwater & terrestrial Grasshopper Beetles Flies Crustacea 2 body sections More than 3 pairs of legs Gills (usually) Freshwater, marine, & terrestrial Crayfish Shrimp Crabs Chilopoda Long segmented body 1 pair of legs per segment Terrestrial Centipedes Diplopoda Long segmented body 2 pairs of legs per segment Terrestrial Millipedes Arachnida 2 body sections 4 pairs of legs Freshwater & terrestrial Spiders Ticks Scorpions
Classes of Arthropods • • • Insecta Crustacea Chilopoda Diplopoda Arachnida
Insect Body Structure • Typically have three sections – Head – Thorax (middle) – Abdomen • Six legs
Insect Body Structure • Most insects have two pairs of wings • Compound eyes
Insect Body Structure
Grasshopper • Circulatory system with blood • Many-sectioned tubular heart • One artery • Open circulatory system
Grasshopper • Tracheae – Spiracles – Insecticides • Excretory tubules
Grasshopper Structures
Insect Metamorphosis • • Molting Incomplete metamorphosis – Egg – Nymph – Adult
Incomplete Metamorhosis
Insect Metamorphosis • Complete metamorphosis – Egg – Larva – Pupa – Adult
Insect Metamorphosis • Larva – Caterpillars – Maggots – Grubs
Insect Metamorphosis • Pupa – Cocoon – Chrysalis – Puparium • Look different after each stage of complete metamorphosis
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