Abraliopsis
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
Pharyngula
Evolution, development, and random biological ejaculations from a godless liberal
There’s a familiar beast plaguing the fish of the Jersey coast: a tongue-eating isopod.
Mr Chambers told BBC Jersey: “When we emptied the fish bag out there at the bottom was this incredibly ugly looking isopod.
“Really quite large, really quite hideous – if you turn it over its got dozens of these really sharp, nasty claws underneath and I thought ‘that’s a bit of a nasty beast’.
“I struggled for weeks to find an identification for this thing until, quite by chance I stumbled across something that looked similar in a Victorian journal.
“Apparently there’s not too much ill effect to the fish itself except it’s lost its tongue.”
As we scientists like to say in our inimitably technical manner: ewwwww.
They must be devolving into dinosaurs (no, not really)! Great tits normally live on a diet of seeds and insects, but when those resources are scarce, they’ll fly into caves and kill and eat bats. They don’t do it unless they’re really hungry — they prefer bugs and bacon, as do we all — so the interesting thing about is that these birds can push the boundary of what is expected of their species.
Follow the link, it has a short movie of a tit picking up a bat carcass and flying off to a branch to tear at it. Appetizing!
I know, my title is very controversial…but the BBC has a photo gallery of Arctic jellies. Judge for yourself!
This picture has a little story behind it. Over 250 million years ago, our world experienced the most massive extinction event known, with over 99% of all individuals on the planet dying out abruptly, and diversity was greatly limited for a few million years after that. One possible explanation for the Permian extinction is a correlated series of massive volcanic eruptions that burned through thick coal deposits and drowned the earth in CO2 — global warming on a massive scale. Even cephalopods suffered. The ceratatid ammonoids had been in decline for a long time, but the extinction nearly wiped them out, reducing them to only a few struggling genera.
But then something interesting happened. After the great extinction, the ammonoids exploded in diversity, radiating rapidly. Something about them had made some of them capable of riding out the disaster, and then exploiting the changed world afterwards.
One speculative explanation for the secret of their success is the ability of some members of the cephalopod clade to survive in cold, nearly anoxic conditions, like Vampyroteuthis infernalis. They were able to rebound quickly because of their dismal metabolism and the general fecundity of cephalopods. They restored some ecological webs faster than previously thought and provided an environment for further growth of more severely crippled clades.
It just goes to show you that our current episode of global warming is a relatively minor event. Life will go on. Fast-living organisms with high metabolic demands like, say, humans, might suffer and die from the environmental consequences of a high CO2 atmosphere, but don’t worry — the cephalopods will live on. They might even get a happy surge in numbers from the changes.
Brayard A, Escarguel G, Bucher H, Monnet C, Brühwiler T, Goudemand N, Galfetti T, Guex J (2009) Good Genes and Good Luck: Ammonoid Diversity and the End-Permian Mass Extinction. Science 325(5944):1118-1121.
Marshall CR, Jacobs DK (2009) Flourishing After the End-Permian Mass Extinction. Science 325(5944):1079-1080.
