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This “Sailor’s Eyeball” Blob Is One Of The Largest Single-Celled Organisms On Earth

December 2, 2023 by Deborah Bloomfield

There are sailors’ eyeballs to be found at sea, that is, if you know where to look. Fortunately not the result of any gouging injuries, these curious blobs are a type of algae called Valonia ventricosa, and they’re one of the largest single-celled organisms on Earth.

The size of sailor’s eyeballs can vary from a speck the size of a pinhead, to, well, an eyeball. Just how big the blob gets all comes down to the contents of its vacuole – the space inside its cell wall. 

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You see, V. ventricosa is unicellular, but it can contain the nuclei of many cells. This is because they’re coenocytic organisms, meaning they’re made up of a mass of cytoplasm containing many cell nuclei that aren’t separated by a cell wall. 

The unusual arrangement comes with a fun party trick. If you pop a sailor’s eyeball – the algal version, please – it can actually result in more V. ventricosa springing up as they only need one cell nucleus to grow into new organisms, reports Science Alert.

sailor’s eyeball alga, Valonia ventricosa

Very silvery indeed.

And hoo boy, are they poppable. The sometimes-vast cytoplasm vacuole contains nuclei organized in lobes that radiate from its center, creating an internal anatomy the New Heaven Reef Conservation Program describes as “something like a Tesla plasma ball”.

Sailors’ eyeballs are often spotted by divers drifting through coral reefs in tropical and subtropical regions of the world’s oceans. They can vary in color from bright green to black, and sometimes very silvery because of the unique structure of their cell walls’ cellulose crystals.  

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The shimmering coloration is reminiscent of the NOAA Ocean Exploration’s “golden egg” mystery when they found an alien-like shiny orb on the seabed of Alaska. The shiny blob was spotted at a depth of 3.1 kilometers (2 miles), anchored to a rocky surface. Most curious of all, the mysterious object had a hole in it, inspiring one researcher to say during the live feed, “Something tried to get in… or to get out.”

Sailors’ eyeballs, on the other hand, are just trying to get on with their day, so don’t you go popping those weird jelly blobs now, will you?

Deborah Bloomfield
Deborah Bloomfield

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Source Link: This “Sailor’s Eyeball” Blob Is One Of The Largest Single-Celled Organisms On Earth

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