This document summarizes 8 major groups of invertebrates: 1) Arthropoda - includes insects, arachnids, crustaceans; have jointed legs and external skeleton. 2) Echinodermata - have spiny skin and radial symmetry. 3) Mollusca - have soft, shapeless bodies. 4) Annelida - are segmented worms found in water and soil. 5) Nematoda - are roundworms, some of which are parasitic. 6) Platyhelminthes - are flatworms, some of which are parasites without digestive systems. 7) Porifera - have pores all over their bodies to take

1. INVERTEBRATES
Animals without a Backbone or Spinal Column:

2. Different Phyla
1. ARTHROPODA
3. MOLLUSCA
8. CNIDARIA/
COELENTERATES
7. PORIFERA
6. PLATYHELMINTHES
5. NEMATODA
2. ECHINODERMATA
4. ANNELIDA

3. Characteristics of Each Groups of Invertebrate
Arthropoda Means jointed legs
They have no bones but they have a hard outside covering called
exoskeleton which serve as protection or support.

4. ARTHROPODA
CRUSTACEAN
INSECTA
ARACHNIDA
CHILIPODA
DIPLOPODA

5. Arthropoda) are the largest phylum of animals and include
the insects, arachnids, crustaceans, and other similar creatures.
Insects-
Insects are generally small in size and possess segmented
bodies supported by an exoskeleton made mostly of chitin.
The body is divided into a head, a thorax, and an abdomen.
The head supports a pair of sensory antennae, a pair
ofcompound eyes as well as the mouth; the thorax has six legs
(one pair per segment) and wings (if present in the species).
The abdomen has excretory and reproductive structures.

6. Arthropoda) are the largest phylum of animals and include
the insects, arachnids, crustaceans, and other similar creatures.
Arachnids The arachnids are easily distinguished from the insects by the
fact that they have eight legs instead of six.

7. Arthropoda) are the largest phylum of animals and include
the insects, arachnids, crustaceans, and other similar creatures.
Crustaceans They include various familiar animals, such
as lobsters, crabs, shrimp and barnacles. They are
variously found in marine and freshwater, with a few
terrestrial members

8. Characteristics of Each Groups of Invertebrate
ECHINODERMATA Means spiny skinned animals
Their hard bodies are covered with spines and have a design know as radial
symmetry

9. Characteristics of Each Groups of Invertebrate
MOLLUSCA Means soft bodied animals
They have soft bodied and are shapeless.

10. Characteristics of Each Groups of Invertebrate
ANNELIDA Means segmented worms
They live in fresh and marine water as well in the soil.

11. Characteristics of Each Groups of Invertebrate
NEMATODA Means round worms
They are long slender and smooth. Some of them are parasitic and can be deadly.

12. Characteristics of Each Groups of Invertebrate
PLATYHELMINTHES Means flat worms
Some of them are parasites .They have no digestive system because they feed on
the digested food of their hosts.

13. Characteristics of Each Groups of Invertebrate
PORIFERA Means pore – bearing invertebrates
They have pores all over their bodies. They take in food and oxygen through
their pores

14. Characteristics of Each Groups of Invertebrate
CNIDARIA/COELENTERATA
Means hallow bodied animals with stinging tentacles
Their tentacles have sting cells with poison-filled thread called
nematocysts
NEMATOCYST- A capsule within specialized cells of certain coelenterates a threadlike
tube that delivers a paralyzing sting when propelled into attackers and prey.

17. 1. ARTHROPODA
3. MOLLUSCA
8. CNIDARIA/
COELENTERATES
7. PORIFERA
6. PLATYHELMINTHES
5. NEMATODA
2. ECHINODERMATA
4. ANNELIDA
Means jointed legs
Means spiny skinned animals
Means soft bodied and shapeless
animals
Means segmented worms
Means round worms
Means flat worms
Means pore – bearing invertebrates
Means hallow bodied animals
with stinging tentacles

18. Rearrange the following letters to form new words
1. They are covered with spines
A T A M R E D O N I C H E
2. They are soft bodied and shapeless animals
A C S U L L O M
3. They are segmented worms
A D E N L I N A
4. These worms have long, slender, and smooth bodies.
A D O T A N E M
5. These worms have flat bodies.
S E T H N I M L E H P L A T Y
E C H I N O D E R M A T A
M O L L U S C A
A N N E L I D A
N E M A T O D A
P L A T Y H E L M I N T H E S

19. Rearrange the following letters to form new words
6. They have pores all over their bodies
7. They are hallow bodied animals with sting tentacles.
A T A R E T N E L E C O
8. The largest phylum and they have jointed legs.
R A P E R I F OP O R I F E R A
C O E L E N T E R A T A
R O H O T A R P A DA R T H R O P O D A

20. 1. ARTHROPODA
3. MOLLUSCA
8. CNIDARIA/
COELENTERATES
7. PORIFERA
6. PLATYHELMINTES
5. NEMATODA
2. ECHINODERMATA
4. ANNELIDA