2. astronomy-to-zoology:

    Fire Urchin (Asthenosoma varium)

    …a species of fire urchin found throughout the Indo-Pacific, ranging from the Red Sea to Australia and Southern Japan. True to its name the fire urchin has venom tipped spines which can inflict a extremely painful sting on a potential predator or an unwary diver. This sting is nonlethal but can last for a couple of hours, causing a pain similar to being burned. The fire urchin is often seen with a commensal passenger (usually P.colemani or Z.adamsii) which feeds on passing food items that fall on the urchin.



    Image Source(s)

    (via medusajellies)

  3. montereybayaquarium:

    It may not be built for speed, but it’s plenty tough! We have a leather chiton in our Splash Zone Kelp Garden exhibit. This football-shaped chiton can reach five inches, has strong protective plates, and thrives on exposed rocky coasts and in strong wave action.

    It’s considered a keystone species as it eats a brown algae.  Without the leather chiton, this algae would predominate. 

    Learn more about our Splash Zone

    (Kathleen Olson)

    (via medusajellies)

  4. astronomy-to-zoology:

    Helmet urchin

    (Colobocentrotus atratus)

    also referred to as Shingle Urchins are a a species of sea urchin of the family Echinometridae. they can be found on rocks nears shores of the Indo-West Pacific particularly in Hawaii. they look very different from other sea urchins as their spines have been modified to be flattened and smooth in order to better withstand the waves that crash against the rocks they live on in order to feed on periwinkles and algae. they are usually a maroon color and grow as big as a softball.



    (via medusajellies)

  5. lifeunderthewaves:

    And the Rocket’s Red Glare… by Tropigal1027 Taken at the Monterey Bay Aquarium, California

  6. h4ilstorm:

    Light Show (by Lawson Bruen)

    (via medusajellies)

  9. luminescentlabs:

    Aequorea victoria!

    This beautiful jelly, (aka “the crystal jelly”) was the unlikely star of the 2008 Nobel Prize in Chemistry.  Its a palm-sized hydromedusae and has about 150 tentacles laced with pressure-activated poison harpoons, known as nematocysts. Don’t worry, it’s no harm to humans, but its voracious appetite includes small floating animals and even other Aequorea! Around Aequorea’s ring are small glowing photocytes that give off a blue bioluminescent glow. But, these photocytes are coated with a green fluorescent substance that immediately absorbs the blue light and transforms it, making Aequorea look like a green blinking spaceship when poked. Photo: David Gruber/Vincent Pieribone. Animation: Emma Welles.

    (via mooonjellies)

  10. lifeunderthewaves:

    SeaUrchin 2 by CagdasDevrimSon