Sea Gooseberry videos

Prey's-eye view of a sea gooseberry. Unlike sea anemones and jellyfish, which have stinging tentacles, those of sea gooseberries are sticky

Higher magnification movie of the propulsion system - hairs (cilia) that are fused into eight rows of saw-tooth combs. Each row can be stopped and started independently, giving very precise directional control. The beating combs create flickering interference colours.

Side view of a sea gooseberry swimming

The long, trailing tentacles dangle below the animal. Swimming into a swarm of sea gooseberries, some of which are large enough to catch small fish, would be a fatal mistake for any small planktonic animal.

These are some videos of the sea gooseberries that I caught yesterday and posted at http://beyondthehumaneye.blogspot.com/2009/09/sea-gooseberries.html

and

http://cabinetofcuriosities-greenfingers.blogspot.com/

You can read more about these remarkable animals at http://www.ucmp.berkeley.edu/cnidaria/ctenophora.html

and

http://faculty.washington.edu/cemills/Ctenophores.html

Sea Gooseberries

Eight rows of beating hairs, arranged like rows of combs,

propel comb jellies in the surface plankton

The microscopic beating hairs create green, orange and blue

interference colours that shimmer across the animal's surface

At higher magnification you can see the combs of hairs, that beat in synchrony.

A tentacle is trailing off to the left

Here tentacles of two sea gooseberries have become temporarily entangled

Prey's eye view of a sea gooseberry, seen from below with tentacles extended

Another view from below. Sea gooseberries spend their lives in the few centimetres below the surface of the ocean, drifting in the plankton

I collected these sea gooseberries after they were washed up by the incoming tide at Warkworth on the Northumberland coast this afternoon (see http://cabinetofcuriosities-greenfingers.blogspot.com/2009/09/sea-gooseberries.html ). Stranded on the sand, they look like minute glistening blobs of jelly, but suspended in water they’re revealed as exquisite planktonic animals, as transparent as glass. The largest is about 5mm. in diameter. These are predators, with eight rows of beating hairs that help them to hold station in the water column and long, dangling tentacles that snare their prey – other planktonic animals. When the rows of hairs - which are arranged like minute combs – beat in rhythm they create electric green, orange and blue interference colours that light up their transparent bodies. They also have one final trick – which I couldn’t photograph. When you turn the light off two minute green bioluminescent organs inside the animal glow in the dark. They probably act as lures, helping the sea gooseberry snare its prey. I've posted videos of these animals under the microscope at http://beyondthehumaneye.blogspot.com/2009/09/sea-gooseberry-videos.html