An Odd Little Blue Sea Slug.

By Anita in Animals & Pets on Mar 21, 2007 at 5:07 pm

Blue Dragon Sea Slug

This Glaucus Atlanticus (also known as a Blue Sea Slug) was photographed in a rock pool in New South Wales, Australia. They measure less than 2 inches long, float on their backs (this photo shows the slug’s belly), and feed on small sea creatures and the deadly Portuguese Man o’ War. Link [Flickr]


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  1. Ali
    Mar 21st, 2007 at 6:48 pm

    Hehehe…it looks all floppy and squishy!!

  2. Ali
    Mar 21st, 2007 at 10:38 pm

    *gasp* Naked branches?! O_o

    Oh wait…my bad! :p

  3. Heather
    Mar 21st, 2007 at 11:22 pm

    looks like stitch from Leilo and Stitch

  4. Brutal
    Mar 22nd, 2007 at 3:24 am

    Whoever speaketh of Cthulhu shall remember that he but seemeth dead, he sleeps, and yet he does not sleep, he has died and yet he is not dead, asleep and dead though he is, he shall rise again.

  5. Ali
    Mar 22nd, 2007 at 3:56 am

    @Brutal

    Are you another brother of the Order?

    Phnglui mglw’nafh Cthulhu R’lyeh wgah’nagl fhtagn! O_o

    (I can’t believe I have that memorised…)

  6. Tom p
    Mar 22nd, 2007 at 7:58 pm

    i am a fisherman and would love to catch one of these

  7. Joe Smoe
    May 29th, 2008 at 5:07 am

    I think that the blue sea slug needs more information. It is a very complex creature and needs to be decribed with more detail.

  8. Linda
    Oct 15th, 2008 at 6:29 am

    If you want to die a horrifying death… catch one of these… This little guy, which grows to be about 6 cm, makes his venom by eating Portuguese Man O’ War jellyfish which are by themselves already very dangerous. They extract the venom made by these jellyfish and enhance it to an even worse and more dangerous venom… Now that is what I call recycling ;P

  9. Oliver
    Feb 15th, 2009 at 2:31 pm

    The blue sea slug attaches itself to jellyfish and Hydrazoas like the Portuguese man of war. It feeds on its stinging tentacles and is immune to their sting. The smaller stinging cells get digested whilst the stronger stinging cells get transfered to the Nudibranch’s extremities. Using the jellyfish or hydrozoa’s stinging cells for its own defense.

  10. rara206
    May 2nd, 2009 at 9:15 am

    I am doing a science project on the blue sea slug it is pretty amazing.it has a gas like bubble that keeps it floating on the top of the water.It should be more discripted because you cant find much on it by itself


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