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Arthropods – notes Major Groups of Arthropods “jointed foot” Common Characteristics of ALL Arthropods Arachnids Centipedes and Milipedes Crustaceans 1. Arachnids - _________________and their relatives 2. Crustaceans – _________________, shrimp, and crayfish 3. _________________ 4. Millipedes 5. _________________ and their relatives – grasshopper, cricket, roaches, beetles, etc Largest group of animals Many are highly social 1. Have _________________ appendages which include legs, antennae, claws and pincers 2. Have _________________symmetry, segmented bodies, exoskeletons, a body cavity, a digestive system with two openings and an advanced nervous system -Most have separate sexes and reproduce sexually 3. Body _________________ Bodies of these animals are divided into specialized segments 4. _________________A hard outer covering that supports and protects the internal body and provides places for muscle to attach. Doesn’t _________________ as the animals does, it is shed and replaced during a process called molting Advantages Disadvantages 1. _________________ 1. Must molt as animal grows 2. prevents dessication 2. limits_________________of animal • Have ___________ body regions – Cephalothorax and an abdomen • __________ pairs of legs and no antennae • Many are adapted to kill _________ with poison glands, stingers, or fangs • Some are parasites _________________________ – Have sharp, poison filled stinger at the end of abdomen. – Have a well-developed appendages which they can grab their prey. _______________________ – Can’t chew their food, release enzymes into prey to digest it—then suck the predigest liquid into its mouth. – Have book lungs where O2 and CO2 are exchanged. _______________ and _____________________ -- Most are parasites – Ticks have specialized mouthparts to remove blood from the host. – Ticks often carry disease such as Lyme disease. • Have long bodies and many ______________, exoskeleton, jointed legs, antennae and simple eyes. • Found in _______________ environments • Reproduce sexually - Centipedes are ________________ - Millipedes feed on decaying _____________ matter. • • • Have one or two pair of ____________________ and mandibles, which are used for crushing food. Most live in ______________, but some live in moist environments on land—such as pill bug. Have ___________ pair of legs, first pair of legs are claws for catching and holding food Insects • Have __________________ body regions - _______________- Has a pair of antennae, eyes and a mouth - _______________- Three pairs of legs and one or two pairs of wings if present are attached here - _______________- Where reproductive structures are found. • ____________________ symmetry- cephalization, and well developed nervous systems Have an __________ circulatory system that carries digestive food to cells and removes wastes Insect blood doesn’t carry O2 instead air enters and exits through openings called _________________ found on the abdomen and thorax Are the only invertebrate animals that can ____________ Insects are extremely successful based these reasons – Tough flexible, waterproof _________________ – Ability to___________ – _______________ reproduction cycles – Small sizes – Use a variety of __________ sources Insects have other adaptations that allow them to be successful • • The success of Insects • • • Value of Insects • • • • A source of _________________ Agriculture would be impossible without bees and other insects to _______________ crops Useful chemicals are obtain from some arthropods Important part of ecological community Review! Practice! Name the phyla each of these organisms belong Tapeworm _________________ Earthworm _________________ Jelly Fish ___________________ Sea Star ____________________ Octopus ____________________ Ant _____________________ Hydra _________________ Heartworm _______________ Crocodile ________________ Sponge __________________ Clam ___________________ Crab ____________________ Score: _____/ 12 Practice! Name the phyla each of these describe Has a backbone ______________________ First with true tissues __________________ Has no true tissues _____________________ First with a one-way digestive tract __________________________ Has jointed appendages ________________________________ First with a closed circulatory system ______________________ First phyla to show bilateral symmetry _____________________ Water Vascular System _____________________________ Score : _______/8