There are eight main groups of invertebrates: mollusks, flatworms, annelids, roundworms, poriferans or sponges, echinoderms, coelenterates, and arthropods. Each group has distinct characteristics - mollusks have soft bodies and shells, flatworms can regenerate, annelids have segmented bodies, roundworms have long thin bodies, poriferans are made of loosely joined cells, echinoderms have spiny skin divided into five parts, coelenterates have soft or sack-like bodies and tentacles, and arthropods have many legs and segmented or divided bodies. Examples are given for common animals in each

1. Classifications of Invertebrates
Science V

2. What are the five groups of
vertebrates?
Give the characteristics of these
animals.
Review

3. What are warm blooded animals?
Cold blooded animals?
Checking of Assignment

4. What do you call those animals
without backbones?
Can you give examples of this group
of animals?
Motivation

5. 1. Form 7 group groups.
2. Then group the animals
according to their similarities.
3. Can you classify these animals into
their own group?
Presentation

6. Presentation

7. 1. The pupils will present their work.
2. The leader will tell something
about the animals in each group.
3. What are the classification of
invertebrates?
Concept Formation

8. Invertebrates are animals without a backbone
There are eight groups of invertebrates
> Mollusks
> Flatworms
> Annelids
> Roundworms
> Poriferans or Sponges
> Echinoderms
> Coelenterates
> Arthropods

9. > Molluscs are soft-bodied invertebrates that
usually have shells for protection
> Crawl on a single fleshy pad
> Examples are snails, squids, oysters, and
octupuses

10. > A flatworm can be cut in two and each piece
will grow into a new worm!
> In fact, there are even some kinds of
flatworm which can regenerate complete
worms from almost any piece of their
bodies. Ex. Tapeworms and liver flukes

11. > The annelids or segmented worms include
earthworms and leeches.
> Have round worm like bodies
> Have bodies divided into segments

12. > Nematodes or roundworms have long thin
round worm like bodies
> Their body plan is simple (no segments).
> Examples are ascaris and hookworms

13. > Poriferans or sponges are pore bearing
animals that have bodies made of loosely
joined cells
> Ex. Venus’ flower basket, tube sponge,
calcareous sponge and chicken liver sponge

14. > Echinoderm means "spiny skin."
> Have bodies divided into five parts.
> Have spiny outer covering.
> Ex. Starfish, sea urchin, and sand dollars

15. > Cnidaria are animals with hollow and
soft bodies or thin sack like bodies
> Have tentacles for locomotion
> Ex. Are jellyfish, sea anemones, and corals

16. Arthropods have lots of legs and segmented
bodies
There are four groups of arthropods
> Arachnids
> Centipedes & Millipedes
> Crustaceans
> Insects

17. > Arthropods – Arachnid have four pairs of
legs
> Have bodies divided into two sections
> Includes spiders, scorpions, ticks, and mites

18. > Arthropods – Centipedes have flattened
bodies divided into two segments: the head
and the trunk.
> Arthropods - Millipedes have cylindrical
bodies of about 20 to more than 100
segments. The body is divided into head,
thorax,and trunk.

19. > Arthropods – Crustacean are characterized
by the presence of two pairs of antennae
located on the head and five or more pair of
legs for swimming and walking
> First pair often used as pincers and bodies
covered in shell
> Ex. Lobsters, crayfish, crabs and shrimps

20. > Arthropods – Insects have three pair of legs
> Bodies divided into three sections: the head,
the thorax and the abdomen and often have
wings
> Ex. Fly, termites, mosquito, ants, wasps,
bees, bugs, locusts, silverfish, beetles,
dragonflies, damselflies, ladybugs, lice, etc.

21. Where can you find these animals?
If you happen to see earthworms or
even centipedes, are you going to kill
them? Why?
Application

22. What are the classification of
invertebrates?
Evaluation

23. Group the following animals into
Molluscs, Flatworms, Annelids,
Roundworms, Sponges, Echinoderms,
Crustaceans & Arthropods.
shrimp, centipedes, butterfly, bee,
starfish, clam, snail, octopus, corals,
earthworm, ascaris sponges, blood
suckers
Evaluation

24. Give other examples of animals in
each group.
Assignment