ARTHROPODA SHOW

CLASS INSECTA
CLASS ARACHNIDA
CLASS MYRIAPODA
CLASS CRUSTACEA
 SYMMETRY: Bilateral
 REPRODUCTION: Sexual
 MOVEMENT: varies (most have legs to move on)
 FOOD: Carnivores and Herbivores
Jointed legs
IN GREEK: Jointed legs
4 CHARACTERISTICS:
 EXOSKELETON
 JOINTED APPENDAGES (as seen above: jointed legs)
 SEGMENTED BODY (as seen above: Head, thorax, abdomen)
 OPEN CIRCULATORY SYSTEM
 OPEN CIRCULATORY SYSTEM:
 Blood is pumped into body cavities where tissue is
surrounding this cavity. The oxygen and nutrients
diffuse into the tissues and then into the cells.
 CLOSED CIRCULATORY SYSTEM:
 Blood is pumped through vessels (veins and arteries)
throughout the body. The blood is always in a closed
tube. (just like humans)
 EXOSKELETON:
 We have an internal skeleton, where arthropods have an
external skeleton. They have NO bones on the inside,
only a hard skeleton on the outside they must “MOLT”
to grow.
 MOLTING
 All arthropods must molt, or shed their outer skeleton to
grow or change their shape. Molting is controlled by
hormones within the body of the arthropod.
 GREEK FOR: Hard exoskeleton
 Contain two pair of antennae and mouth parts for
crushing and grinding food.
 Crustaceans breathe through the use of GILLS.
Here are some examples:
Millipedes are herbivores
millipedes
Why are we always found in damp places, like
under rocks?
Our exoskeletons are not waterproof, so we live in damp
places because we don’t want to lose excess water.
ALL HAVE 4 OR 8 LEGS
SPIDERS
2 MAIN BODY SEGMENTS:
•HEAD/THORAX
•ABDOMEN
MITES (DUST MITES)
SCORPONS
TICKS
3 BODY SEGMENTS
ALL HAVE 6 LEGS ATTACHED
TO THE THORAX (CHEST)
METAMORPHOSIS – to
transform
PHEROMONES – HORMONES
THAT ATTRACT MATES
STINGERS, CAMOUFLAGE,
POISON, SPINES, ETC.
 The horseshoe crab isn’t a true crab or even a
crustacean. While they are arthropods, they are most
likely related to spiders and ticks. It’s considered a
living fossil.
 Spiders bite their prey and secrete digestive juices to
liquefy their prey. They suck up the liquefied
remains….YUM!
 There are more species of Arthropods than any other
of the phyla combined!