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2015/01/25

MONTESSORI ZOOLOGY : External Parts of Arthropoda




The Arthropod

Arthropods have a body which is
divided into three parts : a head,
a thorax and an abdomen.

Body

The body is made up of many segments 
joined together. These segments help
the arthropod to move with ease.

Compound Eye

Some arthropods' eyes receive
a multiple image. The compound
eyes are  able to detect even
the slightest movement. 
  
Wings

Wings are attached to the
thorax of the arthropods that fly. 

Tympanum

The first segment of the abdomen
of the arthropod has an oval eardrums.
The oval eardrum is called the tympanum.

Mouth

 The mouth of the arthropod is
an opening between the two heavy jaws.
The mouth contains teeth for chewing food.

Sound Receptors

Some arthropods have
sound receptors on their forelegs. 

Head

The head of many arthropods is dominated
 by a pair of large compound eyes. 

Appendages

Appendages are jointed limbs.
Appendages help the arthropod move.
Some appendages have special shapes 
and uses such as for swimming, for
getting food and for walking.

Antennae

 The two antennae are used as sense receptors 
for touch and for smell in some arthropods.
Occeli

The three simple eyes of the arthropod 
are called ocelli. Ocelli are light-and-shade
sensitive and may be able to form
crude images at close range. 

Thorax

The thorax is the second division of 
the arthropod's body, often consisting 
of three segments. each segment
has a single pair of legs. 

Exoskeleton

The exoskeleton is the hard covering
on the body. It is made of a tough material
called chitin. The exoskeleton protects
 the soft body of the arthropod.

Exo : means outside 

Abdomen

 The abdomen is the hindmost body
division of the arthropod and consists
of eleven segments. The last segment
is modified for reproductive purposes.

Anus

The anus of the arthropod is
an opening behind the last
segment of the body.


    

 Pinegreenwoods Montessori
Montessori Zoology