Transcript Arthropods ppt

Arthropods
Insects, Spiders, Crustaceans,
Myriapods
Insect body plan
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Incomplete metamorphosis
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Complete metamorphosis
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Crustacean body plan
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Coleoptera
Coleoptera (Beetles)
• 400.000 species.
• First pair of wings changed into hard
(chitin) shells. Second pair of wings need
to unfold for flying as shells open up.
• Strong jaws to chew different kinds of
food.
• Complete metamorphosis.
Lepidoptera
Lepidoptera (Butterflies)
• 180.000 species.
• Both pairs of wings covered with light
breaking (skin)flakes producing brilliant
colours schemes.
• Long, wound-up, tube-shaped “tongue”.
Hymenoptera
Hymenoptera (Wasps, Bees)
• 130.000 species.
• Two pairs of thin, see-through wings.
• Some species live in large strutured
societies.
• Have defensive, poisonous stings.
• Complete metamorphosis.
Diptera
Diptera (Flies)
• 240.000 species.
• One pair of wings. Second pair often
changed into balancing organs.
• Food is digested outside the body and
sucked in.
• Many flies imitate wasps and bees.
• Complete metamorphosis.
Orthoptera
Orthoptera (Grasshoppers)
• First pair of wings changed into tough
covers.
• Strong jaws to chew plant material.
• Some species are able to communicate
with sound.
• Incomplete metamorphosis.
Arachnida
Arachnida (Arachnids)
• 100.000 species.
• Spiders, scorpions,
ticks and harvestmen.
• Often poisonous and
carnivorous.
• Others, ticks, are
parasites.
Crustacea
Crustacea (Crustaceans)
• 50.000 species.
• Strong pincers work like scissors and cut
off pieces of food.
• Have gills for breathing
• Two main body plans: “crab” and “lobster”
Myriapods
Myriapoda (Myriapods)
• 13.000 species
• Number of legs vary
from 10 – 750
• Centipedes have one
pair of legs per
segment.
• Millipedes have two
pairs of legs per
segment.
• Both plant eaters
(Millipedes) and
poisonous carnivores
(Centipedes)