Arthropods!
Arthropods: Arthropods constitute over 90% of the animal kingdom.
The word Arthropod literally means jointed legs. ***First phylum to have joints***
They are invertebrates (no backbone)
They have true appendages.
Muscular-SkeletalThe body is segmented, the segments usually
grouped in two or three distinct regionsExoskeleton made of chitin
When they outgrow their exoskeleton, they molt!
MoltingPaired segmented appendages.
DigestionTube from mouth to anusDivided into segments:
the foregut, the midgut, and the hindgut
NervousAnterior ganglion or brain and paired nerve
cordsSome have developed sensory ability
CirculationHave an open circulatory system that carries
food, but not oxygen throughout its bodyBlood is often green since it does not carry
oxygenThe heart is a simple tube running along the
back
RespirationRespiration by means of gills or book lungs
and spiracles
ReproductionThe sexes are nearly always separateException: barnacles (hermaphrodites) and
some insects (parthenogenesis)
ExcretionPasses waste
out of its anus from the hindgut
No nephridia *** Instead they
have malpighian tubules***
SymmetryBilateral Symmetry
