domingo, 13 de octubre de 2013

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



 
 

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