UNIT 2 INVERTEBRATES
Invertebrates are animals which do not have a skeleton or a backbone.

 

 

 

Many invertebrate bodies are protected by shells or exoskeletons:

 

 

 

 

INVERTEBRATE CHARACTERISTICS AND GROUPS

 

  

We can learn more in this web:







UNIT 2 INVERTEBRATE GROUPS

First, let´s see some interesting videos:

 



 

 

 



UNIT 2  INVERTEBRATE GROUPS

The classification of the invertebrate groups is based in a simple question:

Do they have any body protection? 

 

If they haven´t body protection, you can find these groups:

• SPONGES
• CNIDARIANS
• WORMS

If they have body protection, you can find these groups:

• ECHINODERMS
• ARTHROPODS
• MOLLUSCS
  

SPONGES

CNIDARIANS

WORMS

 

 

 

ECHINODERMS



 

 

 

MOLLUSCS

 

 

 

 

 

 

ARTHROPODS

 

 

 

 

 



 



UNIT 2  ARTHROPODS

Arthropods are animals that have a hard outer shell called exoskeleton that supports and protects the animal's soft body.  

 

They have the body divided into two or three parts.

• two parts: cephalothorax and abdomen
• three parts: head, thorax and abdomen

Arthropods are scientifically classified as members of the phylum Arthropoda, the largest phylum in the animal kingdom.

 

CLASSIFICATION OF ARTHROPODS

A simple and short classification of arthropods is based on these characteristics:

• number of body parts
• existence or not of antennae and wings
• number of pairs of legs

As a result we can identify four groups:

• crustaceans
• insects
• arachnids
• centipedes and milipedes

 

Here you can see a more complex classification:

 

 

CRUSTACEANS

INSECTS

ARACHNIDS

CENTIPEDES AND MILIPEDES

 

 

UNIT 2  ANIMALS: VERTEBRATES AND INVERTEBATES SUMMARY
A pretty chart about the clasification of animals:

 

 

If you want to know how animals are classified remember this order:

 

 

The same for the classification of humans but be careful becouse this chart is upside-down:

 



 

UNIT 2  ANIMALS: VERTEBRATE GROUPS

The following pictures and information are from this web:

 

You can find games and other activities in it!

 

MAMMALS

BIRDS

 

FISHES

 

AMPHIBIANS

 

REPTILES