Arthropod diversity Flashcards
arthropod body plan
segmented body with jointed limbs
what do Arthropods share with annelids?
through gut
ventral nerve cord with segmented ganglia
dorsal circulatory system
what is Arthropod skeleton made of?
chitin, proteins and mineral salts (CaCO3)
ecological range of Arthropods?
pretty much everywhere
what % of all species are Arthropods?
around 70%
historical persistence pf Arthropods
since Cambrian explosion
reasons for arthropod success
body size
cuticle
flexible bauplan
cuticle success in arthropods
impermeable to water
Maintaining homeostasis
Rate of water loss as low as 0.01%
5 major arthropod groups
Crustacea
Hexapoda
Trilobites
cheliceriformes- spiders, scorpions etc
myriapoda- centipedes, millipedes
Crustacean characteristics
5 segmented head
trunk region- two tagmata
biramous limbs
carapace
nauplius larva
Crustacean Nauplius
medium simple eyes
3 set of appendages
features specific for insects
evolution to flight
metamorphosis
cheliceriformes body plan
two tagmata
no antennae
presence of pedipalps and fangs in spiders
Chilopoda body plan
one pair of legs per segment
highly segmented
compound eyes
Diplopoda
