The Jellyfish Problem
historytoday.com
The Jellyfish Problem
1–10 of 12 posts
Re: The Jellyfish Problem
#2We still have the problem of the ctenophores. "Comb jellies", they used to be, until it turned out they have practically nothing in common with jellyfish except transparency and radial symmetry. Or with anything else.
They use proteins similar to those used by other animals, but for different things. Some people think they evolved muscles and nerves entirely independently of other animals. Some people think they fell from the sky.
Whatever you think, they are astonishing in every detail. Watch videos of Beroe if you have any doubts.
Re: The Jellyfish Problem
#3reminds me of https://meaningness.com/eggplant/definition
Re: The Jellyfish Problem
#4"Since nothing could will itself to move without some sense of where it wanted to go"
https://www.farmersalmanac.com/maple-copters-everywhere-2158...
Re: The Jellyfish Problem
#5We still have the problem of the ctenophores. "Comb jellies", they used to be, until it turned out they have practically nothing in common with jellyfish except transparency and radial symmetry. Or with anything else. They use proteins similar to those used by other animals, but for different things. Some people think they evolved muscles and nerves entirely independently of other animals. Some people think they fell…
Fascinating! Thank you for sharing. They really do look like alien creatures.
Re: The Jellyfish Problem
#6There is no 'true' category for anything.
The Categories Were Made For Man, Not Man For The Categories
https://slatestarcodex.com/2014/11/21/the-categories-were-ma...
Re: The Jellyfish Problem
#7The article didn’t mention phylogenetic analysis of jellyfish genes or genomes, e.g. using 16S rRNA. [1]
[1]: https://en.wikipedia.org/wiki/16S_ribosomal_RNA
A brief search didn’t yield anything on jellyfish phylogeny for me, would be curious if anyone else has information on this.
Re: The Jellyfish Problem
#8There is no 'true' category for anything. The Categories Were Made For Man, Not Man For The Categories https://slatestarcodex.com/2014/11/21/the-categories-were-ma...
> Thus Abraham Lincoln’s famous riddle: “If you call a tail a leg, how many legs does a dog have?” And the answer: “Four – because a tail isn’t a leg regardless of what you call it.”
Enter the kangaroo.
Re: The Jellyfish Problem
#9A good tour of the problems of phenotypic classifications -- which reached their heyday in the funfair of cladism. Always reminds me of Terry Pratchett's jokes about banana classification:
https://www.goodreads.com/quotes/6870748-yes-sir-but-the-lib...
Re: The Jellyfish Problem
#10The article didn’t mention phylogenetic analysis of jellyfish genes or genomes, e.g. using 16S rRNA. [1] [1]: https://en.wikipedia.org/wiki/16S_ribosomal_RNA A brief search didn’t yield anything on jellyfish phylogeny for me, would be curious if anyone else has information on this.
Use "cnidaria" as your keyword?
https://oceanexplorer.noaa.gov/fsts/media/DNAbarcodingCnidar...