The Last Opabiniid, Mieridduryn
ฝัง
- เผยแพร่เมื่อ 17 พ.ย. 2022
- Read the Paper here: www.nature.com/articles/s4146...
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Mieridduryn is the last known Opabiniid. But unlike Opabinia, it had some unique features, which might give us a new understanding of arthropod evolution. - วิทยาศาสตร์และเทคโนโลยี
Let's hope this fossil bed gives Cymru-Wales a few more firsts!
No spoilers... but yeah, there might be... um... one or two... other things to come! 😃
I really debated using Cymraeg for the language, but that I knew I'd butcher. Great to see new stuff out of there though!
@@RaptorChatter what's wrong with using Gymraeg?
I live in North Wales. The hell behind me is just full of fossils. Literally you can just pick up any stone and there's shells, cryinoids, absolutely loads all from the carboniferous
Ooh that’s so awesome and interesting!!! Thanks for keeping us up to date - I don’t think I’d have heard about this discovery otherwise :D
Hey man, I really love your approach - the face to face sets you apart from Ben Thomas and Mothlightmedia in a very good way, keep it up
Thanks! I really appreciate it!
Lots of info delivered quickly and articulately...nice work.
Thanks!
But Pambdelurion does have twin feeding appendages like Radiodonts - with spines. So this paper supposes that those merged, lost the spines, regrew the spines, and then split into two again. That is an extraordinary claim which requires extraordinary evidence.
Pambdelurion also had feet, unlike Anomalocaris.
It's that they're fused though. So the proboscis and arms are built slightly differently. I'm not an arthropod worker, but that's my understanding of what is presented in this paper.
I don't get it that way: rather that a trunk-like structure grew small spines and then split in two and grew larger spines.
From what I could gather, the "arms" of Anomalocaris and the two halves of the "claw" at the end of Opabinia's proboscis are more likely the same kind of appendages, namely antennae that in earlier lobopodians had evolved from bristled sensory organs into barbed prey-catching appendages. And the opabinid proboscis is an elongated first body segment that these antennae are attached to.
@@RokuroCarisu that is an interesting take on Opabinia, especially when you can look at Kerygmachela or (Possibly) Siberion's morphology.
What tells you that Opabinia didn't fuse originally paired appendages?
Dang RIP Opabinia
The two fossils of Mieridduryn are far from perfectly preserved. It cannot be said for sure if the thing on its head is even a complete trunk. It could as well be the remaining one of a pair of appendages, or that the front of the trunk is missing on both specimens. Curious is also that only one eye is visible on the larger specimen and either none or multiple small ones on the smaller specimen. Perhaps the two are not even the same species after all.
Yeah, they're not perfect. Fortunately one of the authors actually commented that they're doing more work on fossils out there, so hopefully they'll show some more of what they've found.
Agreed, the preservation was so poor that the interpretation has to come with some uncertainty. Noting like Chengjiang or Burgess quality, and even there these animals were hard to understand. What says this isn't a nectocaris derivative?
Many thanks for the excellent report, and great to see you've really got to grips with the paper. (Psst... you need to pronounce the second syllable as well... then you won't be far off! 😉Something like Mi-AIR-ri-THIrrin will get you close. Welsh should always sound slightly musical!)
I also saw you say there's more to come! Sounds exciting. The Ordovician is uper underrated imo.
Also I'm very much not an arthropod person, so hearing that I did it justice is great to hear, thanks!
@@RaptorChatter Yes, we're working on several other papers at the moment (and a couple of sponges are already out - look up Nectocollare and Choiaella hexactinophora if you're interested). We're also still collecting intensively, at least when it stops raining! So no, I don't think this is the last you'll hear about Castle Bank... 😉
I totally agree that Ordovician needs more attention; ecology was being revolutionised, diversity was going through the roof, and it's increasingly looking like a lot of modern lineages originated then. It's weird how the Burgess-type preservation basically disappears in the Early Ordovician, and even weirder that it pops up again here. We still don't understand that part, but it's very likely there are more sites like this out there somewhere. Of course, people haven't been looking much outside the Cambrian, though... so fingers crossed for similar sites turning up now that we know it's worth looking.
Fascinating, and go Wales!
I have 5$ on y'all getting out of group.
Tbh opabinia is cool
I think that Tully monster is a late surviving Opabiniid.
No one has any better ideas...
It's either that or the larval form of Spinosaurus....😁
dd in Welsh is closest to th in English
Thanks!
Specifically it's a voiced th/dh sound, identical to the last consonant in "with".
(IPA /ð/)
Etymology???
I just read the Nature paper, so I am going to assume the experts know more than me, and give benefit of the doubt. Objectively, these are poorly preserved and to my amateur eyes hard to see what they are building on from the fossils. It's a non unique solution from 2 samples that are very different. Its amazing they are able to conclude anything given the past issues accurately interpreting radiodonts (and lopopods) from much better preservation at Burgess and Chengjiang biota. Just hope it's not the next claim of a dinosaur bird head in Burmite that ends up being a lizard for Nature to deal with.
The German word Lagerstätte actually means "deposit" or "storage place" from Lager = storage and staette = place. In Geology, it means, as my old Geography teacher used to define, a mineable concentration of minerals.
Possibly in geology, but not in paleontology
@@KellyClowers I am talking about the German meaning of Lagerstätte. Words often shift meaning when they are migrating in other languages. German paleontologists would talk about a Fossillagerstätte to make clear what they mean. English speaking paleontologists leave out the Fossil, because they don't have the original meaning in their language.
the... ✨pan✨ arthropods?...... thank u sm 👀💅 so important to have represention like this
DD in welsh=Th
Thanks! (Ddanks?)
Very true
Haircuts....they exist.