Arthropods. General Characteristics All have jointed legs Evolved from annelids (segmented worms)
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Transcript of Arthropods. General Characteristics All have jointed legs Evolved from annelids (segmented worms)
• All have an exoskeleton made of chitin
• All have bilateral symmetry
WOW BEHAVIOR!• All molt- shed skin to allow for growth (lobster
example)
• Spiders molt too
Arthropods all have an open circulatory system
“Blood” is confined to vessels for only a small portion of it’s circuit through the body.
FIVE CLASSES
• Centipede – one pair of legs per segment
• Millipede- two pair of legs per segment
• Insects- 3 pair of legs per thorax
• Arachnids- 4 pair of legs per thorax
• Crustaceans-5 pair of legs per thorax
Centipedes• Have longer
antennae than other animals in the same class.
• Antennae are sensory organs, used for touch and smell
Feeding • Usually are
carnivorous, eating other arthropods
• Eat snails, slugs, and worms
Millipedes• Millipedes have 2 pair
of legs per segment.• Body has many
segments; as many as 100
InsectsFar out!!
INSECTS undergo metamorphosis• Complete metamorphosis:
– Egg– Larvae– Pupa– adult
Insects have 3 simple eyes between two compound eyes
Flight was an evolutionary advantage to insects• Damselfly goes from water to flight
Common blue damselfly
Drosophila flight
The miraculous honey bee!• Honey bees and relationship to humans
Wild and wonderful
Praying Mantis at the snake buffet
Weevil family
Amazing Mantis!!
Crustacean• Crustaceans all
have a cephalothorax
• Examples are crayfish, shrimp, lobster, and crabs
LocomotionHave 5 pairs of
appendages
Crustaceans have a special appendage used for swimming called a swimmerets
Green GlandHave an organ called
the green gland: which regulates the amount of salt and water in the body
Amount of Legs• All crustaceans have five pair of appendages• And crustaceans have two pair of antennae