The Trouble with Trilobites - presented by Dr. Danita Brandt
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- Опубликовано: 8 фев 2021
- Trilobites, distant relatives of horseshoe crabs, were once the most abundant and diverse animals in the Paleozoic seas that covered most of the Earth (including Michigan) 500 million years ago. However, by the end of the Paleozoic Era, trilobites were extinct. What happened to the trilobites, and why didn’t horseshoe crabs suffer the same fate?
Dr. Brandt is an Associate Professor in the College of Natural Science at Michigan State University. Her paleontological research interests center on fossil arthropods: their evolution, extinction, paleobiology, paleoecology and trace fossils.
Thank you Dr. Brandt for such an interesting presentation.
Excellent presentation. Thank you.
Great presenter! Full of excitement and contagious energy.
I wish we still has trilobites.
Can I interest you in a tribble. No trouble. Guaranteed!! - C, Jones
Potato bugs.
Yes! My thoughts exactly!
What a shellfish desire.
this was a lovely lecture thanks for uploading afterwards
Fascinating
Fantastic presentation! Phenomenal content. The Geological timeline and the life that existed in these different periods has always fascinated me. The question why don’t trilobites still exist has always intrigued me. I didn’t know any of this info until viewing this . Top notch. I can’t say enough.
If you want to see some nice chitons, the Oregon coastline has many species! I used to love collecting and studying them.
I LOVE trilobites
The lesson here is: Terabytes good, trilobites bad!
If predators, who survived, ate all the trilobites, what did they eat after the trilobites were gone?
So, on one of the graphs presented by Dr. Brandt, one sees a significant radiation of crustaceans as, and after, trilobites go extinct. One might hypothesize that as crustaceans moved into the ecospace previously occupied by trilobites, perhaps they also replaced the trilobites in the trophic pyramid.
Dr Brandt, if "fossilization is the exception not the norm" where are the current exceptions ? I wonder about where are sediments currently forming, Mississippi delta ?, Ganges River delta ?, Amazon delta ? and of places like that where lots of sediment is be laid down what types of dead creatures make it to the deposition area rather than being consumed by scavengers on the way, what does it tell us about the diversity of animals verse the number that get fossilized. In a hundred million years will anybody be able to figure out what was living now ?
Watch _Historical geology Christopher Wright_ videos.
Eat your exoskeleton! Nice bit of humour hidden away :)
Begins to start @ 2:41.
I wonder whether they'd be good to eat.
Trilobites!
BSC/PHDS/8&3
This talk is a delightful filling out of the basic info presented in PBS Eon's own "Trouble With Trilobites" episode
ruclips.net/video/Aji2VnQFUCs/видео.html
I guess both arthropods, trilobites and crustaceans were/are TASTY, only trilobites were sessile or very slow movers which were prone to be catched/ preyed upon, but shrimps (including lobster, etc.) and crabs are mostly either good/faster crawlers, swimmers or roamers (or else can choose many places to hide under safe/ strong canopies). Meanwhile Trilobites just simply buried themselves under soft sand, which can be uncovered/exposed easily and be eaten.
Says, sea Anemones and many sea worms are mostly sessile/standstill too, i guess Anemone are not Tasty or/plus they are POISONOUS, with their stings while worms are too small to invest the effort catching.
So that s it, the hypothesis of why trilobites were catched to extinction ?? not to mentioned the GreatEvent of mass-anihilation that killed firstly/most of the living on the sea floor, the unmovable sessile being while the fast mover crustaceans could migrate to s'where else, rich in food or oxygenated seafloor.
Best Rgards.
How do we know that trilobites are not more closely related to isopods?
Edit: the deep water antarctic giant isopod looks more like a cross between an isopod and a crab
It looks like a pill bug
They are both in the same phylum of arthropods. Isopods are in the subphylum crustacea and triobites are in the subphylum trilobitomorpha. The closest living relative to the trilobite is most likely the horseshoe crab.
Play @ 1.25 speed. Your welcome🙏
Watching videos on human evolution: DNA does not survive more that a few hundred thousand years to perhaps one million years. Getting some to survive for 250 million years is implausible.
800000 is good. we weren't quite human then.
What's your point? We have a fossil record of the evolution of humans from common ancestors with apes until today
Audio: 0/10
Little effeminate narrator going on here…..
just hope he doesn't tell you he's a woman and it'll all be fine
@@dragonfox2.058
She IS a woman.
{:-:-:}