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Arthropods!. Do Now: Turn in Earthworm dissection. Phylum Arthropoda. Biggest phylum of animals currently alive and extinct. Several MILLION different species Exist in every environment, in almost every ecosystem on Earth. - PowerPoint PPT Presentation
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Arthropods!
Do Now:
1. Turn in Earthworm dissection
Phylum Arthropoda• Biggest phylum of animals
currently alive and extinct.• Several MILLION different
species• Exist in every environment, in
almost every ecosystem on Earth.
• By any measure, the most “successful” animal phylum. ¾ of all known species of animal are arthropods.
What Makes an Arthropod?
• Exoskeleton:– Hard, protective
outer “shell.”– Used for movement– Made with chitin, a
polysaccharide.
Exoskeleton for Muscle Attachment• Your muscles are attached to an endoskeleton.• An exoskeleton serves the same purpose
What Else Makes an Arthropod?
• Bilateral symmetry
Segmented body plan• Each segment has at least 1 pair of appendages.– Legs, antenae, flipers, claws, etc. are all appendages.– Some segments may be fused together.
3 Main Body Sections • Called tagmata: Some may be fused
Jointed Appendages (and lots of ‘em)
Recap: Arthropod Characteristics
• EXOSKELETON• Bilateral symmetry• Segmented body plan (3 main sections: head,
thorax, abdomen)• Jointed appendages (many pairs). Note: arthropod
means “jointed foot.”
Arthropod Circulatory System
• Open circulatory system with heart.
Arthropod Respiration• Gills/book lungs: oxygen diffuses into blood• Trachea: air moves into insect directly
Types of Arthropods
• Domain: Eukyra• Kingdom: Animalia• Phylum: Arthropoda
• Classes: Crustacea, Insecta, Arachnida (+ Myriapoda
The Family Tree
Class Crustacea: The Crustaceans
• Only arthropod class with 2 pairs of antennae.
• Includes crabs, lobsters, shrimp, as well as pillbugs.
Class Crustacea: The Crustaceans
Crustacean Orders
• “True” Crustaceans = Order Decapoda– 5 pairs of thorasic legs– 2 tagmata• Cephalothorax• Abdomen
• “Pillbugs” = Order Isopoda– 7 pairs of thorasic legs– 3 tagmata
Class Insecta• 1 pair of
antennae
• 3 pairs of legs
• 3 tagmata
• Wings or wingless
Insect Diversity
• Biggest order of animal on Earth
• Over 900,000 documented species.
• Highest estimates suggest up to 30,000,000 species may exist.
Class Arachnida: Spiders, Ticks, Scorpions, Mites, etc.
• No antennae
• 4 pairs of legs
ArachnidsTrilobites =
Extinct Arachnids
Centipedes And Millipedes: Class Myriapoda
• One pair of antennae.• Two tagmata: head and trunk
2 pairs of legs per segmentMillipedesubclass diplopoda
1 pair of legs per segmentcentipedesubclass chilopoda
Recap: Arthropod Family TreePhylum Arthropoda
Class Crustacea
Class Insecta
Class Arachnida
Class Myriapoda
Deca-poda
Iso-poda
many orders many orders, including extinct trilobites
Chilopoda
diplopoda
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