New Jellyfish Discovered: April 24, 2016

Published on Apr 25, 2016 oceanexplorergov

"This stunningly beautiful jellyfish was seen during Dive 4 of the 2016 Deepwater Exploration of the Marianas expedition on April 24, 2016, while exploring the informally named "Enigma Seamount" at a depth of ~3,700 meters.

Scientists identified this hydromedusa as belonging to the genus Crossota. Note the two sets of tentacles — short and long. At the beginning of the video, you'll see that the long tentacles are even and extended outward and the bell is motionless. This suggests an ambush predation mode. Within the bell, the radial canals in red are connecting points for what looks like the gonads in bright yellow.

Video courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

Learn more about the expedition here: http://oceanexplorer.noaa.gov/okeanos..."

Why Jellyfish Float Like a Butterfly—And Sting Like a Bee | Deep Look

Published on Sep 29, 2015 Deep Look

"Jellyfish don’t have a heart, or blood, or even a brain. They’ve survived five mass extinctions. And you can find them in every ocean, from pole to pole. What’s their secret? Keeping it simple, but with a few dangerous tricks.

DEEP LOOK: a new ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe and meet extraordinary new friends. Explore big scientific mysteries by going incredibly small.

--- Why do Jellyfish Sting?

Jellyfish sting to paralyze their prey. They use special cells called nematocysts. Jellyfish don’t have a brain or a central nervous system to control these stinging cells, so each one has it’s own trip wire, called a cnidocil.

When triggered, the nematocyst cells act like a combination of fishing hook and hypodermic needle. They fire a barb into the flesh of the jellyfish’s prey at 10,000 times the force of gravity – making it one of the fastest mechanisms in the animal kingdom. As the barb latches on, a thread-like filament bathed in toxin erupts from the barb and delivers the poison.

The nematocyst only works if the barb can penetrate the skin, which is why some jellies are more dangerous to humans than others. The smooth-looking tentacles of a sea anemone (a close relative of jellies that also has nematocyst cells) feel like sandpaper to the touch. Their nematocysts are firing, but the barbs aren’t powerful enough to puncture your skin."

Deep Sea Creatures

Scientists just captured stunning images of deep sea creatures off the coast of Puerto Rico.

Published on May 11, 2015

"Some are so new to us, they don’t even have names."

Portuguese Man o' War: An Organism Made of Organisms?

Published on Mar 30, 2015 SciShow

"When is an organism not an organism? Or, when is it a bunch of different organisms living together? SciShow introduces you to the weird world of siphonophores."

Hydrozoans - Jellyfish Things in Ocean Shores

"PORTLAND Ore. (Reuters) - Millions of jellyfish-like creatures have washed up on beaches along the U.S. West Coast over the past month, giving the shoreline a purple gleam and, at times, an unpleasant odor, ocean experts said on Thursday.

Though not poisonous to most people, beachgoers should avoid the animals because their venom can cause stinging in the eyes and mouth, said Steve Rumrill, an expert at the Oregon Department of Fish and Wildlife.

Known as Velella velella to scientists, and more informally as "by-the-wind sailors," the creatures regularly cluster offshore each spring. But it is unusual for so many to wash ashore at once, especially this late in the summer, he said.

In addition to the millions that have been spotted on beaches from Southern California to Washington, millions more are floating near the ocean surface offshore, Rumrill added.

Ocean experts do not know why more by-the-wind sailors are washing up this year, or why they are arriving later than usual, said Erin Paxton, spokeswoman for the Oregon Coast Aquarium.

Climate change may be a factor, but it is impossible to be certain, Rumrill said. "This is a wind-driven event, and winds are unusual this year," he said.

Though most people think the animals are jellyfish, they are in fact colonies of much smaller creatures known as hydrozoans, Rumrill said.

Hundreds of tiny organisms cluster together to create a gleaming purple body and a translucent sail-like protrusion that looks like a single animal."