CLASS INSECTA

CLASS ARTHROPODA

CLASS MYRIAPODA

CLASS CRUSTACEA

SYMMETRY: Bilateral

REPRODUCTION: Sexual

MOVEMENT: varies (most have legs to move on)

FOOD: Carnivores and Herbivores

4 CHARACTERISTICS: EXOSKELETON

JOINTED APPENDAGES (as seen above: jointed legs)

SEGMENTED BODY (as seen above: Head, thorax, abdomen)

OPEN CIRCULATORY SYSTEM

IN GREEK: Jointed legs

Jointed legs

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.

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.

MOLTINGAll 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 exoskeletonContain two pair of antennae and mouth parts

for crushing and grinding food.Crustaceans breathe through the use of GILLS.

Here are some examples:

Hermit

crabs Lobster

s

Barnacles

Daphnia

Shrimp

millipedes

“thousand-leggers”

centipedes

Centipedes are Carnivores. Millipedes are herbivores

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.

TICKS

SCORPONS

SPIDERS

MITES (DUST MITES)

ALL HAVE 4 OR 8 LEGS

2 MAIN BODY SEGMENTS:•HEAD/THORAX •ABDOMEN

Arachnophobia

3 BODY SEGMENTS

ALL HAVE 6 LEGS ATTACHED TO THE THORAX (CHEST)

PHEROMONES – HORMONES THAT ATTRACT MATES

STINGERS, CAMOUFLAGE, POISON, SPINES, ETC.

METAMORPHOSIS – to transform