invertebrates - scienceathawthorn

CLASSIFICATION

CLASSIFICATION involves putting SIMILAR THINGS together in groups We do this so that Scientists can SHARE DATA about NEW SPECIES

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Most (95%) of SPECIES can be CLASSIFIED INTO

PLANTS ALL PLANTS can make their own food by PHOTOSYNTHESIS

ANIMALS ANIMALS Feed on OTHER LIVING THINGS. HERBIVORES Eat other Plants CARNIVORES Eat other Animals OMNIVORES Eat BOTH Plants and Animals

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CLASSIFICATION OF ANIMALS The Animal Kingdom is split into two MAIN groups: VERTEBRATES – Have a bony skeleton with a Backbone

INVERTEBRATESDo not have a bony skeleton And do not have a backbone

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Find your own pictures of Vertebrates and invertebrates

Most small animals are invertebrates

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Vertebrates Animals with backbones can be divided into five more groups: Mammals

Amphibians

Birds

Reptiles

Fish

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4.2a Groups within groups

Most animals are small invertebrates.(NO BACKBONE)

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Invertebrates •These are animals without a backbone • There are eight groups of invertebrates – – – – – – –

1. Molluscs 2. Flatworms 3. Annelids 4. Roundworms 5. Sponges 6. Echinoderms 7. Cnidarians

8. Arthropods is the largest group © Oxford University Press 2008

4.2a Groups within groups Most invertebrates have jointed legs. They are arthropods.

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Arthropods 60% of species classified as arthropods • Have jointed legs and segmented bodies. • Has a hard OUTER SKELETON There are four group of arthropods: – Arachnids – Centipedes & Millipedes – Crustaceans

–Insects © Oxford University Press 2008

Molluscs • Crawl on a single fleshy pad. • Can have a shell

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Flatworms • Have flat worm like bodies

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Annelids • Have round worm like bodies • Have bodies divided into segments

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Roundworms • Have long thin round worm like bodies • Have bodies with no segments

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Sponges • Have bodies made of loosely joined cells

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Echinoderms • Have bodies divided into five parts • Have spiny outer covering

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Cnidarians • Have thin sack like bodies • Have tentacles

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Arthropods 60% of species classified as arthropods • Have jointed legs and segmented bodies. • Has a hard OUTER SKELETON There are four group of arthropods: – Arachnids – Centipedes & Millipedes – Crustaceans

–Insects © Oxford University Press 2008

4.2a Groups within groups

Most arthropods have six legs. They are insects.

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Arthropods - Insects • Have three pairs of legs • Bodies divided into three sections • Often have wings

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4.2a Groups within groups Flies are insects.

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Arthropods - Arachnid • Have four pairs of legs.(8 Legs in Total!) • Have bodies divided into two sections

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4.2a Groups within groups Is this an insect?

NO It is a SPIDER and a SPIDER Is an ARACHNID © Oxford University Press 2008

Arthropods – Centipedes & Millipedes • Have long thin bodies and pairs of legs on each of their many body sections

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Arthropods - Crustacean • Have five-seven pairs of legs • First pair often used as pincers • Bodies covered in shell

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4.2a Groups within groups Is this an insect?

No It is a CRUSTACEAN © Oxford University Press 2008

4.2a Groups within groups Is this an insect?

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4.2a Groups within groups Is this an insect?

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4.2a Groups within groups Many insects have tough covers over their wings. They are beetles.

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A 7 SPOTTED LADYBIRD-WHAT IS IT? An ANIMAL An INVERTEBRATE

An ARTHROPOD An INSECT A BEETLE A LADYBIRD A 7 SPOTTED LADYBIRD

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4.2a Groups within groups

This is a beetle Which is a type of insect Which is a type of arthropod Which is a type of invertebrate © Oxford University Press 2008