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Arthropoda martin 10-8

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  • 1. Martin Maksimov & Vladimir Peshev
  • 2.
    • Arthropod literary means “jointed feet”
    • That is where their name comes from
    • It is a unique characteristic
    • Every 2 out of three – arthropod
    • 10 to the 18 th species
  • 3.
    • Have bilateral symmetry
    • This is so because of their segmented and elongated bodies
  • 4.
    • In 1950s was argued of who their ancestor is
    • It was said they are different groups
    • Segmented bodies tell of another thing though
    • In 1990s it was discovered that arthropods are monophyletic
  • 5.
    • 1996
    • NOWADAYS
  • 6.
    • Hard exoskeleton
    • Jointed segments
    • Pair of appendages at each one
    • Antennae
    • Open circulatory system
    • Lack balance – rely on their eyes
  • 7.
    • Most rely on sexual reproduction
    • Only few are hermaphroditic
    • Depends on habitat:
    • In water – external fertilization
    • On ground – modified appendages
  • 8.
    • Almost all have hard chitin cover
    • It protects them from harm
    • Most have other “weapons”:
    • Venom
    • Pincers
    • Pedipalps
  • 9.
    • Using muscles
    • Exoskeleton provides points for attachment
    • The skeleton is replaced after time
    • The process is called molting
  • 10.
    • Have a shiny, globular abdomen
    • Black and sometimes brown
    • Males about half the female's size
    • Inhabit warmer regions
      • 45˚ N to 45˚ S in latitude
    • The most venomous spider in North America
      • Deaths from bite are very rare (1%)
    • Spin webs that lack shape and form
      • Their silk is stronger than almost all other arachnids
      • The spider usually stays hidden in its web
    • Preys on insects
  • 11.
    • Their body is protected by a hard, dark brown carapace
    • Have two large compound eyes and multiple smaller simple ones
    • Have five pairs of legs for walking, swimming and moving food
    • Can swim upside down
    • Usually are found on the ocean floor
      • search for worms and molluscs (their main food)
    • Their blood is blue
      • Due to hemoacyanine that is used to carry oxygen
    • Amebocyte in their blood fights pathogens
  • 12.
    • Have antennae, shorter than the body
    • Have ovipositors
    • Females are usually larger than males
    • Big hind legs for jumping
    • 2 pairs of wings:
      • Forewings – narrow and relatively hard
      • Hind wings – large
    • Grasshoppers are herbivores
    • Many of the species are green
      • They are hard to find in green grass
  • 13.
    • Some arthropods spread numerous deadly diseases
    • Others feed on the crops that humans grow
      • Swarms can be highly destructive
    • Lobsters, crabs, shrimp and others are important foods
    • Bees produce honey
    • Spiders help us by eating a huge number of insect pests
    • Horseshoe crabs yield important chemicals for making useful drugs
    • Grasshoppers are eaten in many places around the world, as a source of protein
  • 14.
    • Female Black Widow spiders often eat males after mating
    • Cute and Cuddly Dads: Black Widow Dads
      • http://videos.howstuffworks.com/animal-planet/6615-cute-and-cuddly-dads-black-widow-dads-video.htm
  • 15.
    • &quot;Black Widow Spiders&quot;. Desert USA. 27.03.2010 <http://www.desertusa.com/july97/du_bwindow.html>.
    • &quot;Grasshopper Information&quot;. Center for Insect Science Education Outreach . 27.03.2010 <http://insected.arizona.edu/ghopperinfo.htm>.
    • http://tolweb.org/Public/treeImages/Arthropoda.png?x=1543595564
    • Campbell, Neil. &quot;Arthropods&quot;. Biology Eight Edition. San Francisco: Benjamin Cummings, 2008.
    • &quot;Introduction to Arthropoda&quot;. UCMP. 27.03.2010 <http://www.ucmp.berkeley.edu/arthropoda/arthropoda.html>.
    • http://en.wikipedia.org/wiki/Arthropod - picture
    • http://www.uic.edu/classes/bios/bios100/labs/bilateral.jpg - picture
    • http://en.wikipedia.org/wiki/Limulidae - picture
    • http://en.wikipedia.org/wiki/Grasshopper - picture
    • http://videos.howstuffworks.com/hsw/5805-human-interaction-with-arthropods-video.htm - video

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