Arthropoda by Madelyn Coia (Insects, Scorpions, Spiders, Lobsters, Trilobites) Key Characteristics Exoskeleton containing chitin Bilateral symmetry Body segments grouped into specialized regions Jointed legs The jointed appendages are specialized for feeding, locomotion, and sensing Anatomy Thorax- The chest (It also holds the wings if the insect can fly) Eyes- Compound eyes, (made up of several smaller eyes functioning in unison) Antennae- Antennae are the primary sensors of insects Abdomen- Stores digestive system, reproductive organs, and sting organs (if able to sting) The head- Main receptors are located (eyes, mouthparts, and antennae) Digestion Foregut Midgut Hindgut Salivary Glands Alimentary Canal Respiration -Tracheae -Spiracles -Air sacs - Circulation of air: Air is inhaled through the first four spiracles -Carbon dioxide is exhaled through the remaining six pairs of spiracles. Internal Transport Open circulatory system Dorsal vessel Aorta Haemocoel Ostia Excretion Malpighian tubules Waste flows Nitrogenous waste Response Double chains of ganglia Compound eyes. Tympanum Release specified pheromones Movement Muscles are attached to the inside Fast and active Strength of muscle Flight muscles (direct attachment) Flight muscles (indirect attachment) Reproduction Ovariole Ovaries Oviduct Spermatheca Ovipositor Examples Horseshoe crab Scorpions Spiders Ticks Centipedes Facts The word millipede means 1,000 legs, but in fact no millipede has more than 750 legs. Arthropods outnumber all other types of animals combined, with an estimated 1 million species. An adult bedbug can survive up to one year without feeding. A typical bed usually houses over 6 billion dust mites Each year, insects eat 1/3 of the Earth's food crop. Bibliography "A Guide To." A Guide To. N.p., n.d. Web. 21 Mar Arthropods. The Learning Zone: Invertebrate I.D. N.p, n.d. Web. 21 Mar Arthropods. Arthropods. N.p., n.d. Web. 21 Mar "The Digestive System and Its Arthropoda Phylum." Digestive System. N.p., n.d. Web. 19 Mar "Science Explorations: Classify Insects: Zoom in on True Bugs: Arthropods | Scholastic.com." Science Explorations: Classify Insects: Zoom in on True Bugs: Arthropods | Scholastic.com. N.p., n.d. Web. 20 Mar Bibliography (part 2) "CIRCULATORY SYSTEM." Circulatory System. N.p., n.d. Web. 21 Mar "Malpighian Tubules of Insects - Boundless Open Textbook." Boundless. N.p., n.d. Web. 21 Mar