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Mon May 10, 2021, 01:47 AM

'Living Fossil' Thought Extinct For 273 Million Years Found Thriving on Ocean Floor



(Zapalski et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2021)
NATURE

MICHELLE STARR10 MAY 2021

A symbiotic relationship between two marine lifeforms has just been discovered thriving at the bottom of the ocean, after disappearing from the fossil record for hundreds of millions of years.

Scientists have found non-skeletal corals growing from the stalks of marine animals known as crinoids, or sea lilies, on the floor of the Pacific Ocean, off the coasts of Honshu and Shikoku in Japan.

"These specimens represent the first detailed records and examinations of a recent syn vivo association of a crinoid (host) and a hexacoral (epibiont)," the researchers wrote in their paper, "and therefore analyses of these associations can shed new light on our understanding of these common Paleozoic associations."

During the Paleozoic era, crinoids and corals seem to have gotten along very well indeed. The seafloor fossil record is full of it, yielding countless examples of corals overgrowing crinoid stems to climb above the seafloor into the water column, to stronger ocean currents for filter-feeding.

More:
https://www.sciencealert.com/living-fossil-thought-extinct-for-273-million-years-found-thriving-on-the-ocean-floor

19 replies, 8901 views

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Reply 'Living Fossil' Thought Extinct For 273 Million Years Found Thriving on Ocean Floor (Original post)
Judi Lynn May 10 OP
eppur_se_muova May 10 #1
Judi Lynn May 10 #3
eppur_se_muova May 10 #7
TexasBushwhacker May 16 #13
Tom Yossarian Joad May 17 #14
burrowowl May 10 #2
Judi Lynn May 10 #4
GReedDiamond May 10 #5
tavernier May 16 #12
GReedDiamond May 18 #15
tavernier May 18 #16
KS Toronado May 18 #17
tavernier May 18 #18
eShirl May 10 #6
Shanti Shanti Shanti May 10 #8
littlemissmartypants May 10 #9
Kid Berwyn May 11 #10
Martin68 May 15 #11
alfredo May 19 #19

Response to Judi Lynn (Original post)

Mon May 10, 2021, 01:55 AM

1. I was hoping it was a blastoid.

Crinoids survived, why not blastoids ?

OK, I'm kind of goofy over blastoids. But then I'm from Alabama, "the Pentremites State"

?

?w=365&ssl=1

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Response to eppur_se_muova (Reply #1)

Mon May 10, 2021, 04:17 AM

3. Glad you posted an illustration. Had to see more, and was even more amazed:



Symmetrical, like flowers, and snowflakes, etc. Interesting, beautiful. Overwhelming.

Thank you.

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Response to Judi Lynn (Reply #3)

Mon May 10, 2021, 06:59 AM

7. More like starfish, urchins, sand dollars -- i.e. echinoderms.

Not to mention crinoids, as in the article -- they are living fossils by themselves !

Blastoids are extinct members of the phylum Echinodermata. Perhaps it is that five-fold symmetry that catches the eye.

Fine old engraving. Thanks for sharing.

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Response to eppur_se_muova (Reply #7)

Sun May 16, 2021, 05:13 PM

13. I find diatoms fascinating

Single celled algae that have cell walls of silica, rather than cellulose. They look other worldly to me.

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Response to eppur_se_muova (Reply #1)

Mon May 17, 2021, 10:28 PM

14. Related to Graboids?

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Response to Judi Lynn (Original post)

Mon May 10, 2021, 02:47 AM

2. Thanks for link

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Response to burrowowl (Reply #2)

Mon May 10, 2021, 04:18 AM

4. Thank you, burrowowl. 🦉

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Response to Judi Lynn (Original post)

Mon May 10, 2021, 04:25 AM

5. Looks kinda like a shrimp - EAT IT!!

Deep deeep deeeep deeeeep deeeeeep fried.

Disclaimer: I do not eat actual shrimp. Nor fake ones, fried or otherwise.

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Response to GReedDiamond (Reply #5)

Sun May 16, 2021, 11:55 AM

12. I net them from my dive platform

and toss them directly in to the boiling pot on my stove in my galley. Right out of the ocean they are sweet as sugar. Melted butter and lemon. But not this time of the year. The weather has to be cold and blustery. Makes them even more delicious.

Shrimp, that is.

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Response to tavernier (Reply #12)

Tue May 18, 2021, 03:43 AM

15. At first, I was thinkin' U were x-plainin' a tasty recipe 4 the "Living Fossil...

...Thought Extinct For 273 Million Years."

But, apparently, if I got this right, yer talkin' 'bout SHRIMP, not them damn pesky 273 million years ole shoulda been ex-stink-creechers in the pitcher of the OP.

Just like the ones I got in my pitcher.

Goddammit! Now I'm all cold and blustery!!

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Response to GReedDiamond (Reply #15)

Tue May 18, 2021, 07:40 AM

16. Nope, I don't eat anything that ex-stinks.

No danger of exstinking shrimp. You got your fried shrimp, boiled shrimp, bar-b-cued shrimp, shrimp and grits......

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Response to tavernier (Reply #16)

Tue May 18, 2021, 02:35 PM

17. You quoting Bubba to Forrest Gump?

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Response to KS Toronado (Reply #17)

Tue May 18, 2021, 04:37 PM

18. Yup.

Family entertainment every time I serve shrimp. We are easily amused here in the tropics.

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Response to Judi Lynn (Original post)

Mon May 10, 2021, 11:51 AM

8. I was hoping it was one of these...

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Response to Judi Lynn (Original post)

Mon May 10, 2021, 02:12 PM

9. ❤ nt

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Response to Judi Lynn (Original post)

Tue May 11, 2021, 07:32 PM

10. I should have been a pair of ragged claws

Scuttling across the floors of silent seas.

— From “The Love Song of J. Alfred Prufrock” by T. S. ELIOT

https://www.poetryfoundation.org/poetrymagazine/poems/44212/the-love-song-of-j-alfred-prufrock

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Response to Judi Lynn (Original post)

Sat May 15, 2021, 11:22 PM

11. Very cool.

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Response to Judi Lynn (Original post)

Wed May 19, 2021, 10:36 AM

19. The kid in me was hoping for a Trilobite

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