A Review of Chondrichthyan Evolution by Geologic Time Periods

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Жыл бұрын

The cartilaginous fish belonging to the class Chondrichthyes are often labeled as living fossils due to how seemingly little they have changed throughout deep time. In this Elasmocast video, we will see how that is not necessarily the case. Host Ben Goode delves into the Earth's ancient history, exploring every geological time period in the Phanerozoic eon, as well as the accompanying Chondrichthyan evolution throughout ancient history.
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Пікірлер: 14

@catfishcain Жыл бұрын

As always spectacular video. Keep up the great work

@elasmocast Жыл бұрын

Thank you, it means a lot!

@willgoacher9122 Жыл бұрын

Great video Ben

@elasmocast Жыл бұрын

Thank you, Will!

@njfossils Жыл бұрын

This was excellent, well done!

@elasmocast Жыл бұрын

Thank you, very much appreciated!

@howardkerr5351 Жыл бұрын

Hi Ben, great video, I love this content it would be interesting to pick a given geologic marine formation and talk about the shark species found in it as well as the relationships of the existing fauna- HDK

@elasmocast Жыл бұрын

Hello Howard, that’s a great idea! I can think of lots of formations off the top of my head that would be great candidates for something like that.

@Dman9fp Жыл бұрын

Solid video. Of course livin' in FL & digging up/ finding their teeth here (west central & south central fl, wait also a bit of north FL), I have the most experience with cenozoic sharks. But once upon a time several years ago, I did buy (off an auction site) a somewhat big bag of North texas Permian rocks chock full of small to "large" Orthacanthus (xenacanthiform swamp "shark") fossil teeth. Great times, wait actually I've got a Waurika Oklahoma small box of permian matrix somewhere too... saved that for a rainy day or someone else, I keep forgetting I own it lol... also man oh boy do Edestus teeth in jaw "Pop" out better in person (as with several other great fossils, like an american lion skull replica, dugong skull replica, Nice Complete Angustidens shark teeth, etc.). Of course when I saw it at a central FL fossil buying/ selling convention, someone beside me said "Genius idea putting that on the top shelf" lmao. Forget how much they were asking, but it was probably more than 1 or 2 grand ($1000-$2000+) if I recall correctly...

@elasmocast Жыл бұрын

A lot of people tend to have most experience with teeth from the Late Cretaceous onwards. With that said, the bizarre Chondrichthyans alive before then are, in my opinion, some of the most interesting taxa out there. Xenacanth teeth and Edestus tooth whorls are prime examples of that. It’s really fascinating thinking about the incredible diversity in Chondrichthyan history!

@Dman9fp Жыл бұрын

Also people tend to think of Megalodon's reign as the "Golden age of sharks". But, Sharks were likely most Abundant & At their Peak Diversity in.... *Drumroll*.... all the way back in the Carboniferous. That's right, no modern sharks yet, but that's when shark-like cartilaginous fish dominated the most they ever would (as far as we can tell) Edit: & to answer "What's my fav time period"... I mean I was Mega obsessed with the Permian in late 2013- some time in2014 (before really getting into FL fossil hunting and starting to be mega obsessed with sharks around 2016 but I found some Very nice shark teeth in 2014, the connections/ first glimmers in the light bulb started there). To each their own, definitely are loads of thought-provoking issues and trends, etc. mysteries and things to discover about the deep past. But... hmm idk how to broach this without being too philosophical/ spiritual. If you start to say "Dang those chirping birds out there, they didn't exist in the Permian!" then perhaps you're missing the point of being born and appreciating our (wierd/ odd/ unsustainable, etc) place in space and time at Present... but then at least if you don't care much about current animals, you Won't Lose Sanity & Much peace of mind over egregious anthropogenic man-caused trends xD.... trade-offs and balances. [I have lived and struggled thru many a mindset/ place in life yes XD]

@elasmocast Жыл бұрын

It is really interesting how diverse Chondrichthyans became in the Late Paleozoic, and how events like the end-Permian extinction event drastically bottlenecked diversity. We do have great species-diversity today, but broader-group level diversity is a mere fraction of what it was before in the Late Paleozoic.