Organisms
pharyngula | June 1, 2006Some days, I just have to get the cephalopod obsession out of my system with a quick purge of links from the mailbag.
Robot tentacles (via Amygdala)
Squid guts ice cream
Japanese manhole covers
Ancient octopus cartoon (via Holbo)
Octopus T-shirts
It Came from Beneath the Sea
Cephalopods get all the girls
pharyngula | May 29, 2006Lots of people have been sending me the link to the Vintage Octopus Pulp Covers site. It's very cool.
It makes me wonder why so many people are infatuated with cephalopods, though. Weirdos.
pharyngula | May 29, 2006
Once upon a time, there was teeny-weeny adorable little fish called Paedocypris. Then, one day, a population of bulldozers invaded their habitat, and they couldn't compete, and they died.
The good news, though, is that a new species of Paedocypris has been discovered.
Amirrudin said the new discovery was significant because it was the only undisturbed habitat of this species. "There are still thousands of the fish in that peat swamp. My worry is that this habitat will end up like the one in Bukit Merah, disturbed by the construction of a road that killed all the specimens," he said.
Maybe…
pharyngula | May 28, 2006
I never heard of this before: there exists a rare, giant, albino earthworm in the scrub prairies of the Palouse. It grows to be 3 feet long, and smells like lilies.
I scarcely believed it myself—that's also Sasquatch country out there, you know—so I had to look it up. The Giant Palouse Earthworm (Driloleirus americanus) is real. They're so rare, though, that one hasn't been spotted in almost 20 years…until last year. A new specimen was found, and unfortunately, fixed in formaldehyde right away. I thought this quote was a little sad.
Unlike the celebration touched off by last year's sighting…
pharyngula | May 26, 2006
One of the most evocative creatures of the Cambrian is Anomalocaris, an arthropod with a pair of prominent, articulated appendages at the front of its head. Those things are called great appendages, and they were thought to be unique to certain groups of arthropods that are now extinct. A while back, I reported on a study of pycnogonids, the sea spiders, that appeared to show that that might not be the case: on the basis of neural organization and innervation, that study showed that the way pycnogonid chelifores (a pair of large, fang-like structures at the front of the head) were innervated…
pharyngula | May 26, 2006
I'm going to introduce you to either a fascinating question or a throbbing headache in evolution, depending on how interested you are in peculiar details of arthropod anatomy (Mrs Tilton may have just perked up, but the rest of you may resume napping). The issue is tagmosis.
The evolutionary foundation for the organization of many animal body plans is segmental—we are made of rings of similar stuff, repeated over and over again along our body length. That's sufficient to make a creature like a tapeworm or a leech (well, almost—leeches have sophisticated specializations), but there are…
pharyngula | May 26, 2006Octopus kaurna
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
pharyngula | May 25, 2006Read and discuss:
I and the Bird #24 (illustrated!)
Skeptics' Circle #35 (hosted by a pseudo-Skeptico…or is it a pseudo-pseudo-Skeptico?)
Carnival of the Liberals #13
Or talk about anything you want. The pope's presence annihilates ice cream and tampons. Bill Frist really needs to take a shower before working in the Senate. What kind of penalties would be appropriate for Kenny Boy? I'm sure you can all think of something to talk about—I'm buckling down for a few hours to finish reviewing a paper.
pharyngula | May 23, 2006
I just learned (via John Lynch) about a paper on cetacean limbs that combines developmental biology and paleontology, and makes a lovely argument about the mechanisms behind the evolution of whale morphology. It is an analysis of the molecular determinants of limb formation in modern dolphins, coupled to a comparison of fossil whale limbs, and a reasonable inference about the pattern of change that was responsible for their evolution.
One important point I'd like to make is that even though what we see in the morphology is a pattern of loss—whale hindlimbs show a historical progression over…
pharyngula | May 22, 2006
I'm going to briefly summarize an interesting new article on cnidarian Hox genes…unfortunately, it requires a bit of background to put it in context, so bear with me for a moment.
First you need to understand what Hox genes are. They are transcription factors that use a particular DNA binding motif (called a homeobox), and they are found in clusters and expressed colinearly. What that means is that you find the Hox genes that are essential for specifying positional information along the length of the body in a group on a chromosome, and they are organized in order on the chromosome in the…
pharyngula | May 21, 2006Rabbits are the most freaky of all mammals (right, Chris?) They're thriving, though—they're all over my lawn, and if this summer is anything like last year, I'll have to go out about once a week and scrape one off the road running by my house.
I did not know that interesting fact about their scrotum, though.
pharyngula | May 19, 2006Vitrelodonella richardi, the glass octopus
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
pharyngula | May 17, 2006
Whoa, it's been a while since I've said anything about my infatuation with cephalopods (since, like, the last post…). Let's correct that with a nifty paper I found on octopus suckers.
Here's a typical view of a tangle of octopus arms, all covered with circular suckers. The octopus can cling to things, grasp prey and other objects with those nifty little discs, and just generally populate people's nightmares with the idea of all those grappling, clutching, leech-like appendages.
Octopus suckers are actually beautiful little tools, though, with a fair amount of sophistication in their…
pharyngula | May 16, 2006Hmmm…this video of an octopus attacking a man looks as phony as the battle between Bela Lugosi and the rubber octopus in Bride of the Monster to me. It makes for an entertaining break in the grading slog I'm in right now, but it would have been much improved if the octopus had won.
(via Phil))
pharyngula | May 16, 2006
Someone's got a cephalopod fetish…everyone knows how nerdy that makes you, right?
pharyngula | May 12, 2006
Ooooh, what lovely fun: it's a short photoessay of a squid dissection. I think the photo of the gut contents ought to be made available in a much larger size so it can be used as a desktop image, though.
pharyngula | May 12, 2006This one is for those blood-thirsty free-riding sprogs.
Sepia apama
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
pharyngula | May 11, 2006Crap. Coturnix tagged me with this beautiful bird meme, and I am the wrong person to ask. I don't get out much, preferring to sit in the lab or the library, so my favorite birds are all in pieces and dead. But OK, since he asked…
Bird digits
Bird teeth
Bird brains
Jurassic bird brains
Bird lungs
Oviraptor pelves (does that count?)
Cretaceous bird embryos
Four-winged birds
Waimanu
And Archaeopteryx, of course.