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Arthropods. Arthro = Joint Pod = Foot. What do these animals have in common?. Tough Exoskeleton (chitin – “ ky - tin”). Jointed Appendages. Segmented body. Why an exoskeleton?. Protection Flexible or Hard Support Added strength Anchor point Waterproof P revents water loss.
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Arthropods Arthro = Joint Pod = Foot
What do these animals have in common? Tough Exoskeleton (chitin – “ky- tin”) Jointed Appendages Segmented body
Why an exoskeleton? • Protection • Flexible or Hard • Support • Added strength • Anchor point • Waterproof • Prevents water loss
Challenges? • Exoskeleton (armour) does not grow with the animal • Rigid covering allows movement only at joints
Why jointed legs? • Strong/light and adaptable • Antennae, claws, legs, wings, flippers … evolve from the same jointed appendages
Segmentation Why might several body segments help in evolution? • Each repetitive segment can evolve a unique purpose!
Phylum Arthropoda Subphylum Uniramia Chelicerates Crustaceans Centipedes & Millipedes Insects