ARTHROPODA

ARTHROPODA

• arthro = joint; poda = foot
• most numerous phylum of all living organisms
• many arthropod species are undocumented or undiscovered
• make up over three-fourths of all currently known living organisms

ARTHROPODA

• The examples of Arthropoda range in differences
• Can be found in the deep sea and mountain peaks
• King crab (12-foot armspan) to microscopic insects

ARTHROPODA

• They have a stiff cuticle made of chitin and proteins
• This forms an exoskeleton
• Segmented bodies (head, thorax, abdomen)

arthropods

• Jointed legs and appendages
• Bilateral symmetry

ATHROPODA subphylum

• Chelicerata-spiders
• Crustacea-shrimp,lobster
• Myriapoda-centipedes
• Hexapoda-insects
• Trilobita-crab-like organism(extinct)

athropoda

• Arthropods undergo metamorphosis
• This is the transformation from larva to adult
• Changes the way they live and eat
• Enables organisms to reduce competition

Untitled Slide

An arthropod's exoskeleton must be shed and replaced periodically. This process is called molting

Arthropoda molting process

• Enzymes are secreted that loosen the old layers
• The new exoskeleton layers are secreted
• The old exoskeleton splits and falls off
• The new exoskeleton hardens and sets