arthropods by devin holmes. arachnida spiders 2 body regions 6 pairs of jointed appendages first 2...
Post on 08-Jan-2018
213 Views
Preview:
DESCRIPTION
TRANSCRIPT
Arthropods
By Devin Holmes
Arachnida
SPIDERS• 2 body regions• 6 pairs of jointed appendages• First 2 pairs used for feeding• Other appendages are modified as legs for
locomotion• Have no antennae• All spin silk; all do not make webs
Arachnida
TICKS• One body section• Feed on blood• Can expand to 1cm• Can carry disease
ArachnidaMITES• One body section• Usually no visible to the naked
SCOPIONS• Enlarged pinchers, tail with venomous stinger• Live in warm, dry climate• Eats insects and spiders• Paralyze large prey with poison
Crustacea
• Most are aquatic and have feathery gills• Only arthropods that have two pairs of
appendages• Have mandibles for crushing food• Two compound eyes• Many have five pairs of walking legs• Have two or three body parts• Examples: crabs, lobster, water fleas, shrimp,
crayfish, barnacles
Chilopda
Centipedes• Carnivorous-eat soil arthropods, snails,
slugs, and worms• Bite is harmful to humans• Have tracheal tubes for gas exchange• 15 to 181 body parts (always an odd
number)
Diplopoda
Millipedes• Eats mostly plants and dead material• Do not bite• Can spray obnoxious-smelling fluid• 100 segments-each with 2 spiracles and 2
pairs of legs
Merostomata
Horseshoe crabs• Considered living fossils• Unchanged from over 500 million years
ago• Protected by exoskeleton• Migrate to shallow water during mating
season• Female lays eggs on land
Insecta
Insects• Most successful arthropods• Largest group• More species of insects than all other of classes
of animals combined• Mate once or just a few times• Internal fertilization• examples: flies, grasshoppers, butterflies, bees,
and beetles
top related