Arthropods Chapter 28 Characteristics of Arthropods 1. Arthropods

Arthropods Chapter 28 Characteristics of Arthropods 1. Arthropods share four main characteristics: A. Segmented Bodies i. Arthropods can have up to three sections

ii. Head, Thorax and Abdomen Three Body Sections Characteristics of Arthropods 1. Arthropods share four main characteristics: B. Exoskeleton (or outer shell) i. Prevents evaporation of water

ii. Used for protection Characteristics of Arthropods 1. Arthropods share four main characteristics: C. Jointed Appendages i. Examples: Legs, wings and antennae

ii. Give animal flexibility Arthropods 2. Shrimp, spiders and millipedes are all in the phylum ARTHROPODA Arthropods 3. Exoskeleton:

Tough, external covering that is a suit of armor to protect the animal. 4. Purpose = Protection! 5. Arthropod literally means arthros mean jointed

podos means foot or leg Example: Wing, Legs and Antennae Obtaining Food and Oxygen 6. Arthropods obtain food by: a. Scavengers: Eats dead plant and animals

b. Herbivores: Eating plants c. Predators: Eating animals they have killed Circulatory System 7. Arthropods have an open circulatory system. - Blood leaves the blood vessels and moves

through cavities. - Not the same as earthworms! 8. Molting Molting: Shedding of the exoskeleton Insects shed

their outer skeleton to grow Skin not flexible like ours Classification 9. Arthropods are classified based on the number and structure of

their body segments and appendages Groups of Arthropods Group of arthropod Antennae

Body Sections Mouth Parts/ Appendages Crustaceans (Crustacea) Two pairs Two or three body section

Spiders and Relatives (Chelicerates) Insects and Relatives (Uniramia) No antennae

One pair Two body sections Unbranched appendages (Insects have three sections)

Mandibles (chewing) Chelicerae (fanglike) Four pairs of legs Jaws

What is it? Organism Group How do you Know? Spiders and Relatives (Chelicerates

Two Body section Crustaceans (Crustacea) Two pair antennae Insects and Relatives

(Uniramia) Three body sections Crustaceans 11. Function of parts of crustaceans Cephalothorax: Fusion of the head with the thorax; houses most internal organs

Carapace: Exoskeleton that covers the cephalothorax Manible: Mouthpart adapted for biting and grinding food Chelipeds: Large claws that are modified to catch, pick up, crush and cut food Swimmerets: Flipper-like appendages for swimming Spiders and Their Relatives 12. Some Chelicerata include Horseshoe crabs, spiders, mites, ticks and scorpians

13. Chelicerae vs Pedipalps Both are appendages that are attached near the mouth and adapted as mouth parts Chelicerae contain fangs and used to stab and paralyze prey Pedipalps are longer and usually modified to grab prey Insects and Their Relatives

14. Centipedes, millipedes and insects belong to the subphylum Uniramia. Centipedes & Millipedes 15. Whats the difference? - millipede means thousand feet - centipede means hundred feet NO SIGNIFIGANCE!

Insects 16. Three parts of an insect: Head Thorax Abdomen Appendages found on same section on all insects Insects

17. Adaptations to respond to stimuli Compound eye to detect changes in color and motion Chemical receptors for taste and smell on mouthparts Chemical receptors also on their antennae and legs Adaptations for Feeding

18. Insects have various mouth parts in order to get food in a way that best fits them Metamorphosis Complete Gradual

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