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Category: new discoveries
Posted on: February 19, 2008 4:22 PM, by Benny Bleiman
Check out this footage from a recent international expedition called the Collaborative East Antarctic Marine Census. Their mission is part of an effort to take stock of all the life in the world's ocean, but these creatures were filmed in the Antarctic Ocean (Southern Ocean). The bulbous, plantlike structures are called tunicates.
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Comments
anybody know what sort of rig was used to film this? it sure looked like a sled-type camera rig, which if true would crush my awe of the imagery even flatter than i suppose the benthic tunicates and sea spiders in the sled's path got squashed...
Posted by: Rick MacPherson | February 19, 2008 5:37 PM
First, I am going to have to ask you to remove this post and you clearly violating the DSN Accord of 2007 which states in subsection 31b that
Second, the chains in the foreground seem to suggest a towed camera sledge
Posted by: CR McClain | February 19, 2008 5:42 PM
i don't know why those are reported as 'sea spiders', when they're very clearly free-swimming crinoids!
Posted by: horgworm | February 19, 2008 8:23 PM
I second horgworm's comment. The media keep calling these "sea spiders", which is the common name for pycnogonids. Those are certainly not pycnogonids (though the Southern Ocean has some amazing pycnogonids) -- they are crinoids.
Posted by: Frank Anderson | February 20, 2008 10:46 AM
Seriously, what kind of IDIOT would call those crinoids sea spiders?
Posted by: Benny | February 20, 2008 11:40 AM
It may (or may not) be worth pointing out that tunicates are urochordates. They're filter feeders who are not much more than bags of water, but they're special because they're about our second closest relatives--you've got the vertebrates, then the cephalochordates, then the urochordates. (The cephalochordates and chordates probably evolved from a larvel urochordate that never grew up.)
Posted by: Greg Morrow | February 20, 2008 1:45 PM
Thanks to those that pointed out the swimming crinoid thing. I was wondering about those. Seemed to be too many "legs" for a sea spider. I was confused. (I don't study anything with a nucleus, so I suppose confusion is to be expected.)
Posted by: MikeG | February 20, 2008 7:57 PM
Greg, how come the urochordates get all the fun? What if I never want to grow up. *whines* Can't I be a urochordate too?
The way my kids look at me sometimes you'd think I was. Of course I've been known to refer to them as "larvae."
Posted by: Liesele | February 21, 2008 8:51 AM
Liesele, I may have been unclear--we vertebrates (i.e. chordates) are among the urochordate larva that never grew up. We get to have the wild dancing parties with our crazy limbs and heads and things while the stodgy urochordates stay home, stuck to the ocean floor sifting through gallons of sea water looking for bits of food.
I wrote a bit about this a while back in Talking Out of Our Asses. Probably it's not too inaccurate.
Posted by: Greg Morrow | February 21, 2008 1:14 PM
Don't worry, Greg, I get it, I do know we're chordates and all. I was just being silly. Again, blame the kids. Come to think of it how come they get to be all larval and stuff? Who said the pre-adolescents get to act like children anyway?
Incidentally, thanks Benny, I always loved tunicates since we were first introduced to them in high school. They're fascinating for lifeforms which appear so simple in a macro kind of way.
Posted by: Liesele | February 22, 2008 8:47 AM