ARTHROPODS...ARTHROPODS •Most diverse and successful phylum in terms of number of species •¾ of...
Transcript of ARTHROPODS...ARTHROPODS •Most diverse and successful phylum in terms of number of species •¾ of...
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ARTHROPODS
• Most diverse and successful
phylum in terms of number of
species
• ¾ of a million species have been
identified
• 3 x more than all other animal species
combined
• Include : spiders, insects, crabs and
centipedes
• Complex interrelated organ
systems
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UNIFYING CHARACTERISTICS
•Segmented bodies
• # varies among
groups
•Tough exoskeleton
• Jointed appendages
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EXOSKELETON
• Protects and supports body
• Made from protein and a
carbohydrate called chitin
• Vary in shapes, size and toughness
• Ex: caterpillars= firm and leathery,
crabs= tough and hard
• Land arthropods
• Covered in a waxy covering to help
prevent water loss
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JOINTED APPENDAGES
• Extend from the body
wall
• Structures have evolved
into different forms
• Antennae, claws, legs,
wings , flippers,
mouthparts, tails etc
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FORM AND FUNCTION• Feeding
• Herbivores
• Omnivores
• Carnivores
• Mouthparts have evolved in many
ways that enable different
species to eat almost any food
imaginable.
• Range from pincers fangs jaws
• Ex: Nut weevil
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RESPIRATION • Terrestrial
• Breathe through a network of branching tracheal
tubes
• Extend through body
• Air enters/leaves tracheal tubes through spiracles
• Small openings along the sides of body
• Grasshopper
• Some have Book Lungs
• Organs that have layers of respiratory tissue stacked like
pages of a book
• Spiders
• Aquatic
• Featherlike gills
• Lobsters, crabs
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CIRCULATION•Open Circulatory system
• Well developed heart
pumps blood through
arteries that branch to
enter tissues
• Blood leaves vessels and
move through sinuses
• Blood collects in a large
sinus surrounding heart
• Re enters the heart and is
pumped through body
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EXCRETION
• Terrestrial
• Malpighian tubules
• Sac like organs that extract
waste from blood and then
add them to feces or
digestive wastes that move
through the gut
• Aquatic
• Diffusion through tissues