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)