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Arthropods

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  1. Arthropods Molly, Isaiah, Holly, Sean

  2. Body Symmetry • Bilateral http://biologytricks.blogspot.com/2012/05/animal-kingdom.html

  3. Locomotion • Segmented legs • Some have wings • Are adapted to live in almost any habitat • Aquatic, terrestrial, air • Smooth muscles

  4. Nervous System • Dorsal brain and ventral nervous cord • Chains of ganglia serve various parts of body • The brain is made of 3 parts

  5. Digestive System • One way • Have digestive glands • Special because not present in many organisms

  6. Excretory System • Present • Malphigian tubules • Projections of the digestive tract • Help conserve water

  7. Circulatory System • Dorsal vessel • Open system • Alary muscles on each side of chamber • Peristaltic contractions move hemolymph http://www.cals.ncsu.edu/course/ent425/tutorial/circulatory.html

  8. Respiratory System • Spiracles in exoskeleton • Flap like valves • Tracheal trunk and tubes • Tracheole acts as a filter http://www.cals.ncsu.edu/course/ent425/tutorial/respire.html http://www.cals.ncsu.edu/course/ent425/tutorial/respire.html

  9. Skeletal System • Exoskeleton • Provides a lot of space for movement (joints, anchor for muscles and appendages) • Provides protection • Composed of chitin • Other species exoskeletons are composed of lipids, proteins, and calcium carbonate

  10. Skeletal System (Con’t) • Allows for very little growth • Forces organism to molt (shed) • After exoskeleton molts the organism is exposed and vulnerable until new shell hardens • After molt the organism often hides for protection • metabolism slows down during hiding

  11. Reproductive system • Separate sexes (male and female) • Gonads connected directly to ducts located on the ventral surface of the trunk • Sperm is transferred to female within seal packets called spermatophores

  12. Reproductive Sys.(Con’t) • Spermatophores • Little containers of sperm • Not diluted in aquatic areas • Sometimes deposited directly in the female • Some insect or arachnids deposit on ground and leave a chemical signal to attract the female

  13. Class: Crustaceans • Crabs, lobsters, shrimp, wood lice • Generally aquatic • 5 pairs of legs • Crush prey with claws

  14. Class: Centipedes • One pair of legs per segment • Nickname: “hundred-leggers” • Poisonous • Hunters • Vomit on their prey to liquefy them

  15. Class: Millipedes • 2 pairs of legs per segment • Nickname: “thousand-leggers” • Scavenge for decaying plant material, leaves, etc • Detrivores • Non-poisonous

  16. Class: Arachnids • Spiders, scorpions, mites • 2 body segments • 8 legs • Carnivorous • Feed on predigested bodies of insects and other small animals • Drink the blood and insides

  17. Class: Insects • Examples: Flies, bees, ants • Three body segments • Head • Thorax • Abdomen • Six legs

  18. Phun Phylum Phacts • Compound eyes • Tough exoskeleton made of chitin • Called “joint-legged” because they have segmented legs • 84% of animals are arthropods

  19. Works Cited • Barnes, Robert D. "Arthropod (animal Phylum)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 03 Oct. 2014. • Barnes, Robert D. "Reproductive System and Life Cycle." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 01 Oct. 2014. • "CIRCULATORY SYSTEM." Circulatory System. N.p., n.d. Web. 03 Oct. 2014 • "RESPIRATORY SYSTEM." Respiratory System. N.p., n.d. Web. 03 Oct. 2014. • Yeh, Jennifer, "Arthropoda." The Columbia Encyclopedia, 6th Ed.. 2014, "Arthropods." UXL Encyclopedia of Science. 2002, Richard Robinson, "arthropod." A Dictionary of Biology. 2004, Michael Allaby, AILSA ALLABY;MICHAEL ALLABY, "arthropod." World Encyclopedia. 2005, "arthropod." The Oxford Pocket Dictionary of Current English. 2009, and "arthropod." Oxford Dictionary of Rhymes. 2007. "Arthropoda." Encyclopedia.com. HighBeam Research, 01 Jan. 2002. Web. 03 Oct. 2014.