Invertebrate animals 4º

1. 4º GRADE
NATURAL
SCIENCE

2. Characteristics of animals
Animals have some characteristics in
• Animals eat other living things
• Nearly all of them can move from one place
• Some animals are oviparous. They lay eggs
• Some animals are viviparous. They give bir
• Animals have internal parts called organs,
form systems that carry out vital functions

3. Classifying animals
We can classify animals in different wa
We classify animals
according to the type of
food they eat in …..
Herbivores
Carnivores
omnivores
We classify animals
according to the way
they reproduce.
Oviparous
Viviparous
One of the most com
ways to classify an
whether or not the
internal skeleton.
Vertebrate
Invertebra
https://www.youtube.com/watch?v=rzxFTrktN1c

4. Invertebrates
• Invertebrate animals do not have inte
• Invertebrate animals are all oviparou

5. We classify invertebrate
animals as:
Sponges
Jellyfish
Worms
Arthropods
Mulluscs
Echinoderms

6. VOCABULAR
Y
SPONGES
pores
https://www.youtube.com/watch?v=m8a0oNsDEx8

7. Sponges
• Sponges live at the botton of the s
• Sponges are fixed to the ground
so they cannot move around.
• Their body is full of pores (holes)
• Food and water enter their body thr
pores.

8. JELLYFISH
tentacles

9. Jellyfish
•Jellyfish can be very dangerou
•jellyfish have poisonous tenta
•Jellyfish use their tentacles
to defend themselves.

10. WORMS

11. Worms
• Worms have a long soft
segmented body .
• Their body is made up of rings.
• Some worms live in the ground.
• Other worms live in water.

12. Arthropods
• Arthropods are the biggest and
most important group of inverte
• All arthropods have an interna
• skeleton that protects their
• Arthropods have many legs.

13. LADYBIRDBEE BUTTERFLY
SPIDER
BEETLE CRABDRAGONFLY
CATERPILLARKATYDID

15. grasshopper
butterfl
beetle
ladybird
ant

16. Insects
• Insects are the largest group
of arthropods.
• Their body is divided into three parts
head, thorax and abdomen.
• They have two antennae .
• Some insects have wings.
dragonfly

17. A fly is an insect because it has

18. https://www.youtube.com/watch?v=QKr-s3vSgf0
A VARIETY OF GRASSHOPPER

19. Arachnids
• Their body is divided into two
cephalothorax and abdomen.
• The cephalothorax is formed
by head and thorax combined.
• Arachnids don´t have antennae

20. Spider Scorpion
Arachnids

21. Other Arachnids

22. Crustaceans
•The majority of crustaceans h
•body divided into two parts :
Cephalothorax and abdomen.
•Crustaceans have two antennae
•Crustaceans don´t have Wings.

23. A lobster is
a crustacean.
Claw

24. Other examples of crustaceans
scampiSpiny lobster
lobster
crayfish
crab shrimp

25. MOLLUSCS
SQUID OCTOPUS
Molluscs with
internal shell
Molluscs without
internal shell

26. Molluscs
•Some molluscs are terrestrial an
•Some molluscs are aquatic and li
•All molluscs have soft bodies.
•Nearly all molluscs have a shell

28. MOLLUSCS
CLAMS MUSSEL
Molluscs with two she
( shell)

29. MOLLUSCS
SNAIL
Mollscs with one she

30. MOLLUSCS
SLUG
Mollscs without a sh

31. ECHINODERMS
SEA URCHINSTARFISH

32. Echinoderms
•Starfish and sea urchins
• are echinoderms.
•They have many small feet that t
use to move along the botton of
Botton of the o