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Tardigrades

Tardigrades. Bears of the Moss. http://nai.arc.nasa.gov/news_stories/news_details.cfm?article=tardigrades.cfm. Gummy Bear?. Come in a variety of colors Have a gummy outside Look like miniature bears.

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Tardigrades

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  1. Tardigrades Bears of the Moss http://nai.arc.nasa.gov/news_stories/news_details.cfm?article=tardigrades.cfm

  2. Gummy Bear? • Come in a variety of colors • Have a gummy outside • Look like miniature bears http://www.baertierchen.de/tardigrada/

  3. The Water Bear • Name means slow walking • Look like bears in motion • Cling and waddle through substrate http://www.baertierchen.de/tardigrada/

  4. Walks Like a Bear, Looks Like a Bear, Must Be a Bear. (not exactly) http://pathfinderscience.net/tardigrades/cbackground.cfm Class Eutardigrada Tardigrade characteristics: Bilateral symmetry Body length of 0.5-1.2 mm May be armored or not

  5. Class Heterotardigrada • Have no circulatory or respiratory system • Breathe through their skin • Body divided into segments • Have well developed muscles • Pigment from the cuticle, what they ate, or body fluid. http://pathfinderscience.net/tardigrades/cbackground.cfm

  6. Ventral View of Hetrotardigrada • Cirri • Piercing stylets • Molt their cuticles http://nai.arc.nasa.gov/news_stories/news_detail.cfm?article=tardigrades.cfm

  7. Lateral View of Heterotardigrada • Four sets of unjointed legs • Eyespots • Claws http://nai.arc.nasa.gov/news_stories/news_detail.cfm?article=tardigrades.cfm

  8. Water Bear Back Claws Function • Grasping objects • Gaining distance http://www/microscopy-uk.org.uk/mag/artjun00/mmbear.html

  9. NASA LOVES THEM TOO • Close up pic http://nai.arc.nasa.gov/news_stories.news_detail.cfm?article=tardigrades.cfm

  10. Egg of the Tardigrada • Eggs are ornamental • Male and female ( gonochoristic) • Some species female only (parthenogentic) http://nai.arc.nasa.gov/news_stories/news_detail.cfm?article=tardigrades.cfm

  11. Eggs: magnification: 100x • Molting-lay eggs inside their old cuticles • Fertilization is external • Cleavage is total • Embryo undergoes direst development • Growth occurs by increase in cell size http://home1.gte.net/vsjslsk1/waterbears.htm

  12. Anterior End Buccal apparatus Stylets would be extended and the pharynx acts as a pump, sucking the contents in. http://www.baertierchen.de/tardigrada

  13. Magnification: 100x http://www.jg.btinternet.co.uk/bears.html

  14. Putting it all together Ladies and Gentlemen- The Tardigrade! http://www.baertierchen.de/tardigrada/

  15. He’s my cousin? • Relation to Arthropods • Complex cuticle made of chitin which is molted • Have striated muscles • Body cavity that appears to be a hemocel • Nervous system composed of a paired ventral nerve chord http://pathfinderscience.ne?tardigrades/cbackground.cfm

  16. So, what makes a Tardigrade a Tardigrade? http://pathfinderscience.ne/tardigrades/cbackground.cfm

  17. TUN • Lower metabolism to less than .01% of normal • Water content may decrease to less than 1% • Resistant to x-ray of 570,000 Roentgens (500 is lethal to humans), vacuum like outer space, boiling alcohol, pressures six times greater than the bottom of the deepest oceans

  18. How’s the view? Magnification:10x http://www.baertierchen.de/wb_aug00.html

  19. The Water Bear Projects ~Heart transplants- Harness the tardigrade sugar trehelose (tun). Uses it on a rat’s heart, and was able to revive it 10 days later. Human hearts can survive only 4 hours ~Cryptobiosis- apply to humans- use it for space travel http://nai.arc.nasa.gov/news_stories/news_detail.cfm?article=tardigrades.cfm

  20. Water Bears a Final Look • For the love of Water Bears Both pics supplied by: http://nai.arc.nasa.gov/news_stories/news_detail.cfm?article=tardigrades.cfm

  21. “Strange is this animal…because it resembles a bear in miniature.”- J.A.E. Goeze, 1773 All pics supplied by: http://www.baertierchen.de/wb_aug00.html

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