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Vampire sea spiders suck on prey!

Discussion in 'The Lounge' started by dontoe, Aug 14, 2006.

  1. dontoe

    dontoe 3/4 ton status GMOTM Winner

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    Vampire sea spiders suck on prey

    Anna Salleh
    ABC Science Online

    Monday, 24 July 2006


    [​IMG]An unusual Antarctic sea spider with five pairs of legs. Its large proboscis is protruding towards the bottom of the picture (Image: Claudia Arango)

    Weird spider-like creatures that live at the bottom of the ocean and use a 'straw' to suck on their prey are baffling scientists.

    These sea spiders, some of which are blind, are defying scientific classification.

    Marine zoologist Dr Claudia Arango of the Australian Museum in Sydney agrees they are arthropods, but which type?

    She presented her research on these unusual and poorly understood animals recently at the Scientific Committee on Antarctic Research meeting in Hobart.

    "They are very weird looking animals," says Arango.

    For over 100 years, scientists have been puzzling over how exactly to classify sea spiders or pycnogonids.

    They crawl along the bottom of the sea floor, sometimes more than 6000 to 7000 metres down, where they live in the dark, feeding on slow-moving soft-bodied sponges and sea slugs.

    The creatures are segmented and have an exoskeleton, which makes them an arthropod, the same grouping as crustaceans, insects, centipedes and spiders.

    But they also have a very strange collection of features, including a unique feeding structure.

    "They have a proboscis that's like a straw that they insert into the animals and suck out the juices," says Arango.

    Such features make it difficult to fit them into any of the known groups of arthropods.

    "They look like spiders, but they are not real spiders," says Arango. "It's been very hard to place them in a position within the tree of life."

    Arango has been studying the diversity and evolution of sea spiders.

    She has been using DNA and morphology to construct a family tree, using 60 species of sea spiders from all over the world.


    [​IMG]This Antarctic sea spider has a 70-centimetre leg span (Image: Claudia Arango)
    Some scientists believe that sea spiders make up a new very primitive group, at the base of the arthropod family tree.

    But Arango's findings so far support another theory: that they are more closely related to the arthropod group that includes spiders and scorpions.

    She stresses these are only preliminary conclusions though, and the jury remains out.

    Arango says the most interesting sea spiders live in Antarctica. They are more diverse, more abundant, bigger and weirder than other sea spiders, she says.

    "That makes them a very sexy and attractive fauna."

    One type of Antarctic sea spider has an extra body segment giving them five pairs of legs instead of the usual four pairs.

    Another type has extremely long legs spanning 70 centimetres.

    Arnago says the diversity and abundance of sea spiders in Antarctica means they probably play a very important role in its ecology, although this is yet to be elucidated.

    Her research has been accepted for publication in the journal
     
  2. MattK

    MattK 1/2 ton status

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    enough with the spiders!lol
     
  3. 68MUDSTUD

    68MUDSTUD OCD with shiny things

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    yeah wat he said!!!!!!!
     
  4. MTMike

    MTMike 1/2 ton status

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    And you cant spray those ones with starter fluid or brake cleaner and light them ablaze :(
     
  5. ntsqd

    ntsqd 1/2 ton status

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    Nope, the Antartic chapter of the Sierra Club has submerged them in water to protect them.
     
  6. UseYourBlinker

    UseYourBlinker 1 ton status

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    Another reason why I won't go into the ocean.
     
  7. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Must add that to my 'don't do' list.

    Swimming under the Antartic ice pack.


    Damn, have to find something else to do this Autumn break.
     
  8. uberbeans

    uberbeans 1/2 ton status

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    Shudder.

    I have an uncontrollable urge to step on it. I can't believe they are holding one in their hand.
     
  9. wasted wages

    wasted wages 3/4 ton status

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    Reminds me of my ex-wife......
     
  10. midnitewarya

    midnitewarya Sounds like a problem for future me. Premium Member

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    Gawd thats terrifying! It looks like a face hugger from the Alien movies! For real, it looks just like it.
     
  11. lamberthkp

    lamberthkp SITFU Premium Member

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    :eek1: that thing is freaky...
     
  12. y5mgisi

    y5mgisi 1 ton status

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    fortunatly i am rarly at 6000 meters benith the ocean surface
     
  13. TSGB

    TSGB 1 ton status

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    Go to hell Midnite!
     
  14. dontoe

    dontoe 3/4 ton status GMOTM Winner

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    That's what I thought also.............:eek1:



    Must be a male!!! :haha:
     
  15. justhorsinaround

    justhorsinaround 3/4 ton status

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    Guys have bigger noses?
     
  16. dontoe

    dontoe 3/4 ton status GMOTM Winner

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    Carl Malden does!!! :haha:
     
  17. midnitewarya

    midnitewarya Sounds like a problem for future me. Premium Member

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    Hey! What did I do to you?

    :D :o :D :crazy:
     
  18. jekquistk5

    jekquistk5 Weld nekid Premium Member GMOTM Winner

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    So do they only come out at night???
     

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