Glaucilla marginata...blue bottles eater in a green bucket

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    (gamma 0.7, blue up; original above)

    Thanks to SFKelly for pointing me to nudibranches.

    from: www.austmus.gov.au/invertebrates/mal/gallery/glauc.htm
    "Glaucilla marginata. This aeolid nudibranch, and its close relative Glaucus atlanticus, are beautifully adapted for their life of floating upside down in the sea, feeding on the 'bluebottle' or 'Portugese man o' war', Physalia. They store the most powerful of the bluebottle's stinging cells at the tips of their slender cerata (20mm)"

    en.wikipedia.org/wiki/Glaucus_atlanticus
    www.seaslugforum.net/pdf/annew2-2.pdf

    From the "seaslugforum: "The cerata of
    Glaucus atlanticus (Fig. 5) are arranged in a single row in each arch while Glaucilla marginata (Fig. 6) they are in multiple rows." So this must be Glaucilla marginata?

    From the wikipedia site: "Glaucus atlanticus is a nudibranch of the family Glaucidae, the only member of the genus Glaucus. It is 4cm long. The slug is distributed throughout the world's oceans in temperate and tropical waters. G. atlanticus preys on the Portuguese Man o' War, Physalia physalis, Velella velella, the Blue Button, Porpita porpita, and the violet snail, Janthina janthina.

    With the aid of a gas-filled sac that is located in its stomach, G. atlanticus is able to stay afloat at the surface. Due to the location of the gas sac the blue sea slug actually floats upside down. The dorsal surface, actually the foot and underside, is either a blue or blue-white coloration. The true dorsal surface is completely silver-grey. This coloration is an example of counter-shading, which helps protect G. atlanticus from predators from both below and above.

    G. atlanticus is able to feed on P. physalis due to its immunity to the venomous nematocysts. The blue sea slug will consume the entire organism. After consumption it will select the most venomous nematocysts and use them as a defense."

    A kid was collecting plenty of those "fishes" at Honey moon bay, I shot them in his (green) bucket, they were about 10-20 mm large. They were not very reactive; folding in a ball seemed to be their most extreme reaction. Sea creatures were very blue there that day (those, blue bottles and some others).

    Note: as many, I recently went to see "Varekai" by cirque du soleil...and was a bit frustrated by not being allowed to take pictures...but a guess: this (or similar) may have been a source of inspiration for the great costume designer Eiko Ishioka.

    Un enfant ramassait plein de ces "poissons" a Honey moon bay, je les ai photographies dans son seau (vert), ils mesuraient environ 10-20 mm. Tres passifs, leur principale defense semblait etre de ce plier en boule. Ce jour la, les petites creatures de l'ocean etaient toutes bleues (ceux-ci, les blue bottles , et d'autres)

    freef0cus, wendover, Phil Kanstinger, and 17 other people added this photo to their favorites.

    View 5 more comments

    1. Oniric Mermaid 97 months ago | reply

      Really weird and INTERESTING. Great colours and composition

      This magnificent photo was seen in:

      Blue Ribbon Photography (invite only images)

    2. freef0cus 97 months ago | reply

      wow, thanks for my new interesting piece of information for the day on the natural world!
      what amazing creatures they are

      --
      Seen in my contacts' photos. (?)

    3. El Guanche 97 months ago | reply

      Seen in "more than interestingness", and yes, there's more to it! Haven't seen that before.

    4. pierre pouliquin 97 months ago | reply

      :) very! Ohh thanks!! :) :) putting it on flickr pushed me to get info about it, so I've learned as well (cool to know blue bottles do have predators!!) :) yep!

    5. pierre pouliquin 97 months ago | reply

      :) cool to have comments from a mermaid here!

    6. pierre pouliquin 97 months ago | reply

      otra volta, grazie mile! (they were quite numerous there at that time it seems, the kid collected plenty in a short time, but they are small!!! Although I often go to those places, it was the first time I noticed any)

    7. Loops666 97 months ago | reply

      Ha, I've never heard of that before! When I saw the thumb, I thought it was some microorganism.

    8. birds eye viewer 96 months ago | reply

      Incredible!!!! Beautiful!!! Awesome!!!-----etc.etc.
      ---and thanks for the lesson!

    9. **loulou** 92 months ago | reply

      You are invited to add your photo to our group!
      icon
      "The Blues" group!

    10. pierre pouliquin 91 months ago | reply

      Thanks (sorry for delay)

    11. Color Lover 87 months ago | reply

      This would be great in our Contest "Life Under The Big Blue"
      I hope you post his to the Contest and group Pool ^_^

      -

      Hi, I'm an admin for a group called Top 25 Blue, and we'd love to have your photo added to the group.

    12. kate053 87 months ago | reply

      magnifique

    13. jugendlich 79 months ago | reply

      like a little angel of the sea (:

    14. Linda DV 62 months ago | reply

      Hi, I'm an admin for a group called Nice Animals : FRONTPAGE CONTEST : BLUE ANIMALS, and we'd love to have this added to the group!

    15. paulhypnos 60 months ago | reply

      The Glaucilla marginata and Glaucus atlanticus are often confused. This photo shows the Glaucus atlanticus on the left and the Glaucilla marginata on the right of the photograph. The obvious distinguishing feature is that the cerata on the Glaucus atlanticus all come out in one plane. With the Glaucilla marginata the cerata come out in all directions.
      Click on photo below for more detail.

      Glaucus atlanticus and Glaucilla marginata  - AUSTRALIA 1 DSCN4137 copy

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