Download - Arthropods Ch 15.3 7th
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Chapter 15 Section 3
Arthropods
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Objectives:
List the 4 main characteristics ofarthropods
Describe the different body parts of 4 kindsof arthropods
Describe the 2 types of metamorphosis ininsects
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Arthropods:
Have lived for hundreds of millions of years
Adapted to nearly every environment
Insects, spiders, crabs, and centipedes
Largest group of animals on Earth (75% ofall animal species)
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Characteristics ofArthropods:Segmented & specialized3 main body parts: head, thorax, abdomenStructures: wings, antennae, gills, pincers, claws
Jointed limbsArthro means joint, podmeans footEasier movement
External skeletonHard outer covering made of protein and chitinProtection, keeps from drying out
Sensing surroundings (well-developed nervoussystem)Eyes & bristles (sense organs)Compound eyes that detect light (identical light sensitive
units)
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Kinds of Arthropods:Classified by number of legs, eyes, and antennae
they haveAntennae is a feeler that senses touch, taste, or
smell
Kinds:Centipedes & Millipedes
Crustaceans
Arachnids
Insects
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Centipedes & Millipedes:One pair of antennae
Hard head
One pair ofmandibles (mouth parts)
Count legs in each segmentCentipedes: 30-354 legsMillipedes: up to 752!
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Crustaceans:Shrimps, barnacles, crabs, lobsters
Most live in water
Gills for breathing
Mandibles for eating
2 compound eyes
2 pairs of antennae
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Arachnids:Spiders, scorpions, mites, and ticks
2 main body parts: cephalothorax & abdomen
4 pairs of legs
No antennae
Mouthparts called: chelicerae
Simple eyes instead of compound eyes
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Arachnids continued
Spiders are more helpful than harmful
Ticks are parasites that live in forests andgrassy areasCarry diseases: Lymes diseaseSegments of body are joined as one small part
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Insects:Largest group of arthropods
3 main body parts
6 legs
2 antennae
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The World of Insects:Live on land, fresh water, and ocean surfaces
Many are helpful
Flowering plants depend on them for pollination
Some are pests that cause disease or destroy crops
Others pests are like mosquitoes and fleas
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Insect Bodies:3 parts: Head, thorax, abdomen
One pair of antennae
One pair of compound eyes
Mandibles
Each segment has one pair of legs
Some have wings
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Complete Metamorphosis:As an insect develops it changes form
4 main stages:Egg
Larva
Pupa
Adult
(*Butterflies, beetles, flies, wasps, and ants gothrough these changes)
http://fairmanstudios.com/images/complete_metamorphosis.jpg
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Incomplete Metamorphosis:Grasshoppers and cockroaches
Less complicated cycle
3 main stages:EggNymphAdult
Nymphs shed their exoskeleton (molting);like an adult but no wings and very small
http://www.vtaide.com/png/images/grasshopper.jpg
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Quick Quiz:The cephalothroax of a spider consists of a
head and a thorax (T/F)
The legs of most insects attach to the
abdomen (T/F)
Some types of insects live deep in oceanwaters (T/F)
The stages of complete metamorphosis areegg, nymph, and adult (T/F)