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ARTHROPODS

ARTHROPODS. Most widespread and abundant phylum of animals 3 out of 4 animals are arthropods!. Classification. Two major subphylums that marine arthropods are found in Subphylum CRUSTACEA Suphlyum CHELICERATA. CHARACTERISTICS. Exoskeleton made of chitin Segmented body

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ARTHROPODS

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  1. ARTHROPODS • Most widespread and abundant phylum of animals • 3 out of 4 animals are arthropods!

  2. Classification • Two major subphylums that marine arthropods are found in • Subphylum CRUSTACEA • Suphlyum CHELICERATA

  3. CHARACTERISTICS • Exoskeleton made of chitin • Segmented body • Appendages specialized • Sensory, feeding, movement • Can regenerate appendages • Gills to obtain oxygen from sea water

  4. GENERAL CHARACTERISTICS cont… Well developed organ systems • Open CS • Well developed NS • Complete DT • Reproduction-separate sexes and sperm is usually directly transferred to the female

  5. Crustaceans • Largest marine group • Biramous appendages- legs branch off into 2 parts www.obs-vlfr.fr/.../copepods_guide/help.html

  6. http://1.bp.blogspot.com/_e-mPA_6ZQyg/RvXkxRqUXVI/AAAAAAAAECM/xZ4BQgLV00w/s400/crustaceans.gifhttp://1.bp.blogspot.com/_e-mPA_6ZQyg/RvXkxRqUXVI/AAAAAAAAECM/xZ4BQgLV00w/s400/crustaceans.gif

  7. Crustaceans molt-shed their shell & grow a new one as they grow. http://www.dnr.state.md.us/baygame/molt2.jpg

  8. The swimming legs of crustaceans are called swimmerets. http://home.earthlink.net/~wweinkle/crabinternal2.jpg http://www.glf.dfo-mpo.gc.ca/photos/images/white_lobster.jpg

  9. Crustacean Habitats • Mostly a marine group • Insects of the sea • Important members of benthic communities dark nooks (under rocks and crevices)

  10. CRUSTACEAN FEEDING • Detritivores (scavengers) • Parasites • Carnivorous

  11. Maxilopeds- special appendages (arms)for cutting and manipulating food • Mandible- Special mouthparts for chewing food

  12. http://images.google.com/imgres?imgurl=http://www.ucmp.berkeley.edu/arthropoda/crustacea/images/serial_appendages_sm.jpg&imgrefurl=http://www.ucmp.berkeley.edu/arthropoda/crustacea/appendages.html&usg=__iENbe_1_g_87lJzQN9pPDvBhj28=&h=200&w=500&sz=21&hl=en&start=7&tbnid=fl05qzSmOmxIPM:&tbnh=52&tbnw=130&prev=/images%3Fq%3Dmandible%2Bmaxilloped%2Bcrustacean%26gbv%3D2%26hl%3Den%26safe%3Dactivehttp://images.google.com/imgres?imgurl=http://www.ucmp.berkeley.edu/arthropoda/crustacea/images/serial_appendages_sm.jpg&imgrefurl=http://www.ucmp.berkeley.edu/arthropoda/crustacea/appendages.html&usg=__iENbe_1_g_87lJzQN9pPDvBhj28=&h=200&w=500&sz=21&hl=en&start=7&tbnid=fl05qzSmOmxIPM:&tbnh=52&tbnw=130&prev=/images%3Fq%3Dmandible%2Bmaxilloped%2Bcrustacean%26gbv%3D2%26hl%3Den%26safe%3Dactive Serial homology of appendages as seen in a stomatopod. From left to right appendages are: antennule, antenna, mandible, first and second maxillae, first through fifth maxillipeds, 3 walking legs, 5 pleopods with pinkish gills, and uropod.

  13. Copepods -may be the most common animal -important as zooplankton and food source for larger consumers http://mysciencefairproject.net/images/macrocyclops1_zexs.jpg

  14. Parasitic copepod in mako gills http://carlsafina.wordpress.com/2007/07/05/welcome-to-the-hotel-californshark-2/

  15. Many copepods are parasites of fish. http://www.darwinsgalapagos.com/animals/parasitic_copepod_sm.jpg

  16. Barnacles • filter feeders • usually attached to surfaces (very particular about where they attach) http://shiftingbaselines.org/blog/Barnacle.jpg

  17. Amphipods Tiny and shrimp-like Most diverse and widespread small crustacean http://www.reef-eden.net/Amphipod1.jpg

  18. Isopods • flat from top to bottom • successful on land too http://oceanexplorer.noaa.gov/explorations/04etta/background/isopods/media/synidotea_laevidorsalis.html http://blogs.nature.com/news/thegreatbeyond/giantisopod.jpg

  19. Krill • shrimp-like • important in polar waters as food source for whales, penguins, seals http://www.mar-eco.no/learning-zone/__data/page/93/Krill3.jpg

  20. Decapods • 1st pair of legs for defense and getting food • Well developed carapace (outer shell) • Can feel pain http://www.flmnh.ufl.edu/fish/gallery/descript/alligatorgar/bluecrab.JPG

  21. Lobsters • large front claws • - 4 pairs of jointed walking legs • compound eyes on stalks www.metro.co.uk

  22. Lobsters may live to be 100 years old. http://www.cryptomundo.com/cryptozoo-news/giant-crayfish/

  23. Female lobster holds eggs in her swimmerets. www.helgoland-lobster.de/indexe.html http://www.penobscoteast.org/images/lobster_eggs.jpg

  24. Shrimp • Diverse group of crustaceans • Found in salt and freshwater • Important food source for humans and marine life http://www.dfw.state.or.us/MRP/shellfish/commercial/largeimages/shrimp_headroe_eggs_large_ODFW.jpg

  25. Shrimp are scavengers that feed on small pieces of dead plant and animal material (omnivores). stilton.tnw.utwente.nl/shrimp/shrimp1.jpg

  26. CRABS • Small abdomen that is tucked under thorax • Most scavengers • Live along rocky shoreline • Some terrestrial (return to sea only to release eggs)

  27. Mouth Swimming legs

  28. Female crab holds eggs in her abdomen. http://cache.daylife.com/imageserve/00DRgZO7DQehn/610x.jpg

  29. The 2 grasping claws of crabs are also called pincers or chelipeds. http://www.animalwebguide.com/Fiddler-Crab-1.jpg

  30. Sexing crabs • Narrow abdomen is male • Wider abdomen is female http://hawaii.gov/dlnr/dar/images/Samcrabs.jpg

  31. Class Merostomata • horseshoe crabs • Book gills for breathing • Mouth parts for piercing called chelicerae • living fossil http://horseshoe-crabs.com/horseshoe-crab-book-gills.html http://beachchairscientist.files.wordpress.com/2008/07/horseshoe-crab.jpg

  32. Blood is used to test for bacteria in pharmaceuticals • Critical food source for migrating shore birds like the red knot • Conservation efforts to ban use of crab meat as bait

  33. Pycnogonida • Found worldwide • Most are small and deep water • Use a "proboscis " to pierce and suck liquid from seaweeds and various invertebrates.

  34. The Japanese spider crab is the largest arthropod http://huynhwinsituation.files.wordpress.com/2009/03/japanese-spider-crab.jpg

  35. Fiddler Crabs

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