1. Invertebrate Classification
Year 7
Classification
2015

2. Kookaburra Dolphin Alligator Snapper Salamander
Quick Quiz
How many kingdoms exist in the living world & what are their names?
Name the classes the following animals would fit into
Kookaburra Dolphin Alligator Snapper Salamander
What does the word Amphibian mean?
True or False – Amphibians are endothermic

3. Quick Quiz What is a characteristic of reptilian eggs?
What is the Latin name for the Bird Class?
What sub–class do Sharks fit into?
What sub-class do Lampreys fit into?
What sub-class do Tuna fit into?
What are the three groups of mammals and give an example of each type of mammal

4. Invertebrates Invertebrates are animals that do not have a backbone
They are found in every type of habitat, but the largest number are found in the oceans
It is thought the invertebrates were the first animals to evolve. There is fossil evidence of invertebrates as old as 600 million years

5. Invertebrate Sub-Phyla
There are 8 main phyla of animals without a backbone that we will look at:
Cnidarians
Nematodes
Annelids
Platyhelminthes
Poriferans (Sponges)
Arthropods
Molluscs
Echinoderms

6. Cnidarians Pronounced – “nid-air-ee-ans”
Some characteristics of all cnidarians are
They have stinging cells
Their body is shaped like a bag
They have only one opening for food entry and waste removal
Radial symmetry
There are two classes of Cnidarians
Attached bodies – POLYPS
Free-swimming bodies - MEDUSAS

7. Cnidarians Examples include Jellyfish, Coral Polyps and Sea Anenomes.
There is almost different species

8. Worms There are three different phyla of worms
Nematodes (Round worms)
Platyhelminthes (Flat worms)
Annelids (Segmented worms)
Worms can be either free-living or parasitic
They can live in most habitats in the world, with a large number living in water

9. Worms
The largest worm is the South African Giant Earthworm which can grown to 1.3m long
Parasitic worms like the hook and round worm often live inside the bodies of humans!

10. Porifera
Sponges are the simplest animals, they have no eyes, ears, nerves or brain but are still animals

11. Arthropods Arthropods form the largest phylum
It holds about 75% of ALL known animals in this phylum
They are found all over the world in all habitats
Characteristics include
Segmented bodies
Paired jointed limbs
Exoskeleton (an outside/external skeleton)

12. Arthropod Classes There are 5 major classes of Arthropods Insects
Centipedes
Millipedes
Arachnids
Crustaceans

13. Insects
There are at least 1 million different species of insects in the world. The exact number is unknown.
All INSECTS have
One pair of antennae
A body divided into three segments (head, thorax & abdomen)
6 legs (three pairs) located on their thorax

14. Centipedes & Millipedes
Have segmented bodies
One long pair of antennae
Flat body
One pair of legs on each segment
Millipedes
One short pair of antennae
Rounder body
TWO pairs of legs on each segment

15. Arachnids Spiders are the most familiar example of the Arachnid class
Scorpions, Mites & Ticks are also Arachnids
Characteristics include
8 legs (4 pairs)
No jaws or antennae

16. Crustaceans Crustacean means “Crusty-Case”
They include animals such as crabs, lobsters, prawns, shrimps, krill & barnacles
Most crustaceans live in the water, with the exception being the woodlice
Crustaceans have 2 pairs of antennae
There are more than different species of crustaceans
Often called the “insects of the sea”

21. Molluscs Molluscs make up the second largest phylum
Most live in the water but there are a few species that live on land
Characteristics include
A soft body, sometimes covered with a shell
Well developed internal organs
Bilateral symmetry
Muscular ‘foot’ for movement

22. Molluscs

23. Echinoderms Echinoderms - their name means ‘Spiny Skinned’
All echinoderms live in water
They all show radial symmetry
Examples include
Starfish
Sea Urchins
Sea Cucumbers
Brittle Star