vey nice ppt of arthopoda

1. BIOLOGY PROJECT
FA III
IX-B
MADE BY:-
AKSHAT AGRAWAL
ALI MERCHANT
AYUSH NIRWAN
JANMEJAY RATHI
YUVRAJ SINGH

2. ARTHROPODA
 The word arthropod means jointed legs .
Thus, they have jointed legs.
 This are the largest group of animals.
 They are bilaterally symmetrical and
segmented.
 There is an open circulatory system , and
so the blood does not flow in well defined
blood vessels.
 Example: Prawns, spiders, scorpions and
crabs.

3. INTRODUCTION
 An arthropod is an invertebrate animal having
an exoskeleton , a segmented body, and
jointed appendages.
 Arthropods form the phylum Arthropoda, and include
the insects, arachnids ,myriapods, and crustaceans.
 Arthropods are characterized by their jointed limbs
and cuticle made of chitin, often mineralised with calcium
carbonate.
 The arthropod body plan consists of segments, each with
a pair of appendages.
 The rigid cuticle inhibits growth, so arthropods replace it
periodically by moulting.
 Their versatility has enabled them to become the most
species-rich members of all ecological guilds in most
environments.

4. BODY STRUCTURE OF AN ARTHROPOD

5. INFORMATION ON BODY STRUCTURE OF AN
ARTHROPOD
 As the arthropods have a hard exoskeleton, they cannot
bend; movement can only occur at the joints, which
move in one plane only. Although this 'hard' exoskeleton
is cited as a key feature of arthropods it is often less
obvious in some groups, e.g. bees, flies etc.
 There is no doubt that specific structural and
physiological features of arthropods have had a major
impact on their success. Among the most important ones
are:
 TAGMATISATION.
 MUSCULATURE.
 CUTICLE.
 CIRCULATION.

6. KNOW SOME MORE ABOUT ARTHROPODS
 They have over a million described species, making up more
than 80% of all described living animal species, some of which,
unlike most animals, are very successful in dry environments.
 They range in size from the
microscopic crustacean Stygotantulus up to the japenese
spider crab
 Arthropods' primary internal cavity is a hemocoel, which
accommodates their internal organs, and through which
their haemolymph - analogue of blood - circulates; they
have open circulatory systems.
 Like their exteriors, the internal organs of arthropods are
generally built of repeated segments.
 Their nervous system is "ladder-like", with paired ventral nerve
cords running through all segments and forming
paired ganglia in each segment.

7. BODY STRUCTURE OF A COCKROACH