What is this thing? Some friends brought a bunch back from Kyushu, they say it buries its tail in the mud and waves around like seeweed on the sea floor and that they are an expensive delicacy which provides lot of calcium. They called it "Alien", but I have found no mention of anything like this on the internet. It wasnt bad though, just a bit dry. So if you do attempt to eat one, have a beer handy.