Biology Chapter 15-3

Biology Chapter 15-3 - 1 Chapter 15 Section 3Arthropods...

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Chapter 15 Section 3- Arthropods Arthropods Make up the phylum of insects, spiders, crabs, and centipedes. Arthropods are the largest group of animals on Earth. More than 75% of all animal species are arthropods. Comes from Greek meaning “joint foot”. 4 Characteristics of Arthropods 1. segmented body with specialized parts 2. jointed limbs 3. exoskeleton 4. well-developed nervous system Segmented and Specialized Arthropods are segmented like annelids. Contain specialized structures like wings, antennae, gills, pinchers, claws. Three main body parts are the head, thorax, and abdomen. Jointed Limbs Have legs that bend at the joints. Makes it easier to move 1
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External Skeleton A hard outer covering called an exoskeleton . Made of a protein and chitin. Has the same function as internal skeleton - serves as a frame to protect the body. Other functions - suit of armor keeps water in. Well Developed Nervous System receives information from eyes and bristles. The tarantula uses external bristles to sense surroundings.
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Biology Chapter 15-3 - 1 Chapter 15 Section 3Arthropods...

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