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Arthropods
7th Grade Life Science
3 Characteristics of all
Arthropods
• Body Segments
• Jointed Legs
• Exoskeleton
Exoskeleton– hard outer covering
that protects, covers and allows
for muscle attachment.
4 Classes of Arthropods
 Insects
• Arachnids
• Centipedes and
Millipedes
• Crustaceans
Insects
• Three Body Regions = Head, Thorax &
Abdomen
• 3 pairs of legs on the thorax
• Breath through spiracles on the abdomen
Metamorphosis—change in shape
(meta= change/ morph = shape)
• Incomplete metamorphosis—nymphs look
more and more like adults
• Complete metamorphosis – larva undergo
complete change to become an adult
Complete or Incomplete
Metamorphosis??
Complete or Incomplete
Metamorphosis??
Complete or Incomplete
Metamorphosis??
Complete or Incomplete
Metamorphosis??
Complete or Incomplete
Metamorphosis??
4 Classes of Arthropods
 Insects
• Arachnids
• Centipedes and
Millipedes
• Crustaceans
Arachnids
• Spiders
• Scorpions
• Mites and Ticks
4 Classes of Arthropods
 Insects
 Arachnids
• Centipedes and
Millipedes
• Crustaceans
Centipedes and Millipedes
• Centipedes = predators
• Millipedes = herbivores
4 Classes of Arthropods
 Insects
 Arachnids
 Centipedes and
Millipedes
• Crustaceans
Crustaceans
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•
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Crayfish
Crabs
Shrimp
Pill bugs
Crabs
Shrimp
Pill Bugs
Crayfish
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Kingdom –Animal
Phylum – Arthropoda
Class – Malacostraca
Order – Decapoda
Family – Cambaridae
Genus -- Cambarus
Crayfish Anatomy
•Form = Function
Crayfish Circulatory System
Open Circulatory System – Blood is carried from the heart in
Arteries. Used blood pools and returns to the heart through
ostia (no veins to return blood)
Crayfish Circulatory System
Ostia -- Holes in the heart where blood re-enters to be pumped
Crayfish Respiratory System
Gills-- are located at the side of the body
Gills function to exchange Oxygen and Carbon Dioxide for
Cellular Respiration.
Crayfish Respiratory System
Gills-- are located at the side of the body
Gills function to exchange Oxygen and Carbon Dioxide for
Cellular Respiration.
Crayfish Digestive System
1.
2.
3.
4.
5.
Mandible
Esophagus
2 Part Stomach
Intestine
Anus
Crayfish Digestive System
Two-- Part Stomach
Crayfish Digestive System
Cardiac Stomach – Stores Food
Teeth in stomach help to grind
food
Crayfish Digestive System
Pyloric Stomach – Digestion Occurs (digestive
enzymes from digestive gland break down food )
Crayfish Digestive System
Pyloric Stomach – pyloric muscles on the side of the
pyloric stomach help grind food
Crayfish Digestive Glands –
Produce digestive enzymes similar
to our liver
Crayfish – Excretory System
• Anus-- excretes waste from intestine
• Green Glands – Filter waste out of the
crayfish – work similar to our kidneys
– Green glands secrete uric acid near the
antennae.
Green Glands
The End