Invertebrates

Invertebrates are the...

• Smallest group of animals on Earth.

• Largest group of animals on Earth.

Invertebrates can ...

• live in water or on land.

• only live in water.

All invertebrates share one characteristic:

• they have an exoskeleton.

• they do not have a backbone.

We can classify invertebrates into...

• 6 groups.

• 5 groups.

We can classify invertebrates into:

• arthropods,

  molluscs,

  worms,

  cnidarians,

  poriferans and

  equinoderms.

• arthropods,

  molluscs,

  myriapods,

  cnidarians,

  bivalves and

  equinoderms.

Arthropods are...

• the smallest invertebrate group.

• the largest invertebrate group.

Arthropods are classify into...

• gastropods,

  bivalves,

  cephalopods.

• insects,

  arachnids,

  myriapods,

  crustaceans.

The exoskeleton is...

• an external backbone.

• an external skeleton.

The main characteristics of insects are...

• exoskeleton

  eight legs

  most have eight eyes.

• exoskeleton

  six legs

  two antennae

  most have wings.

The main characteristics of the arachnids are...

• exoskeleton

  segmented body

  two antennae

  many legs

• exoskeleton

  eight legs

  most have eight eyes.