Arthropoda (Pt. 2) Trilobites- Invertebrate Paleontology | GEO GIRL
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- čas přidán 26. 06. 2024
- Trilobites belong to the Trilobitomorpha subphylum of the Arthropoda phylum of invertebrate animals. Trilobites dominated the marine realm in the Paleozoic Era. In this video, I cover trilobite morphology (their segmentation and key features on their cephalon, thorax, & pygidium, such as their glabella, furrows, spines, facial sutures, eyes or lack of eyes, cephalic brim, axial lobe, axial rings, occipital ring, number of thoracic segments, etc.), classification (the 12 orders of trilobites and their distinctive characteristics: Agnostida, Redlichiida, Corynexochida, Ptychopariida, Odontopleurida, Lichida, Phacopida, Proetida, Asaphida, Trinucleida, Harpida, Illaenida), ecology, and evolution (about the time range of each order and when the different types of trilobites dominated and subsequently went extinct).
References: Prothero, D.R. (2013). Bringing Fossils to Life: An Introduction to Paleobiology. Third Edition. Chapter 15: Jointed Limbs: The Arthropods. pp. 348-383. Columbia University Press: amzn.to/3nU0ada
GEO GIRL Website: www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, and donate to support the channel if you'd like!)
0:00 What are Trilobites? When did the live?
2:19 Trilobite morphology
9:03 Trilobite orders
9:45 Agnostids
11:24 Redlichiids
12:35 Corynexochids
13:37 Ptychopariids
15:08 Odontopleurids
16:35 Lichids
17:26 Phacopids
20:37 Proetids
21:38 Asaphids
22:50 Trinucleida
23:50 Harpida
24:34 Illaenids
25:34 Trilobite Evolution (general)
26:13 Trilobite Evolution (by order)
27:28 Upcoming content!
27:50 Bloopers!
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Image sources:
www.trilobites.info/ordagnost...
www.trilobites.info/galredlich...
www.trilobites.info/galcoryne...
www.trilobites.info/galodonto...
www.trilobites.info/gallichid...
www.trilobites.info/galphacop...
trilobites.info/galproetida.html
trilobites.info/galasaphida.htm
www.trilobites.info/galharpeti...
www.trilobites.info/galptychop...
2 slide
blogs-images.forbes.com/trevo...
digsfossils.com/fossils/pa_mi...
www.trilobites.info/trilomorp...
www.trilobites.info/eyeholochr...
www.trilobites.info/eyeschizoc...
fr.wikipedia.org/wiki/Trilobi...
www.fossilmall.com/Western-Fos...
www.lifebeforethedinosaurs.com...
www.trilobites.info/galredlich...
www.trilobites.info/galcoryne...
www.trilobites.info/galptychop...
www.pinterest.fr/pin/49595897...
www.trilobites.info/galodonto...
/ 458452437045872815
www.trilobites.info/gallichid...
www.fossilmall.com/EDCOPE_Ente...
fr.wikipedia.org/wiki/Trilobi...
www.iamthedivaczt.com/2013/01/...
www.trilobites.info/galphacop...
www.flickr.com/photos/pcamero...
trilobites.info/galproetida.html
www.trilobites.info/ordproetid...
trilobites.info/galasaphida.htm
www.flickr.com/photos/samgon/...
www.trilobites.info/pictrinuc...
www.trilobites.info/galharpeti...
www.fossilmall.com/EDCOPE_Ente...
www.trilobites.info/galcoryne...
www.fossilera.com/sp/20409/ru...
taxondiversity.fieldofscience....
www.trilobites.info/triloclas...
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I love the slide late in the presentation showing the orders of trilobites vs. geologic time. It shows how their diversity really did "explode" right at the beginning of their evolution in the Cambrian and it shows how devastating the late Devonian extinction really was.
What’s my favorite day of the week? Friday? Saturday? Nope... it’s when GEO GIRL drops a new video.
I ❤️ GEO GIRL!
I love your energy so much, it always makes my week to see your comment, Joe! Thanks so much for all the love and support, hope you enjoy the video! ;D
I really liked the video. I thought your t-shirt was cute too.
I love my Trilobites --- great pets - they do not eat much and they are easy to clean up afterwards and I never have to flush them!!!!!!! Largest is about a foot long. Way too cool!!!!!!!!!!!!!!!!!!!!!
Trilobites are GREAT!!!😃👍💛💛💛💛💛 I think some may still be alive in caverns deep below ground somewhere. I hope they can be rediscovered someday just like the coeliocanth!!!😃👍💛💛💛💛💛💛💛💛
When you talked about the cute name for its butt, it just reminded me of when we talked about Ostracods in micropaleontology. We watched this video and the lady kept saying something along the lines of "and that ostracod just evacuated" lol. On our test, she asked us to talk about something we remembered from the video. And over half the class talked about her using the word evacuated for going to the bathroom.
Haha! Oh wow, that's hilarious! Well at least there was something memorable 😂
I loooooove trilobites! They're my favorite fossil. I'm glad the algo recommended this, subscribed!
best t-shirt ever.
There's more to trilobites than what meets the eye.
I dig it!! Awesome video.
-"If you're in any invert paleontology class you likely have a professor that loves to quiz you on these 12 orders of trilobites"
-yeah! Of course they're the symbol of paleontology class,they're the first thing you'd think of immediately after hearing the word "paleo" after dinosaurs.
Totally agreed! Trilobites are so well known next to dinosaurs and I think they deserve our appreciation! Thanks for the comment, I am glad you like the video! ;D
one of the best presentations i have watched. You really answered a lot of my questions. subbed
Thanks! So glad you found it helpful :D
This was a very well presented and nicely structured presentation. I have somewhere in the region of 600-700 trilobites across all the traditional orders (as well as a couple of Nectaspida) and always want just one more... By the way, Harpetida is the correct spelling for that order. One of the most endearing aspects of trilobites is the richness of the subject material; it's impossible to cover everything in a short bitesize video. Perhaps one feature worth noting is that cephalic sutures are generally considered to have facilitated the moulting process during the lifecycle of the organism, this being another reason why so many Ptychopariida are found without their librigenae or whose cranidia are otherwise significantly disarticulated. I love the Proetida order and it's a source of endless frustration to see misidentification or blurring on eBay and elsewhere, between such genera as Proetus sp. and Gerastos sp. Because the Proetida order has become a taxonomic wastebasket I find it difficult to source publicly available research material on Proetida taxonomy and thereby conduct accurate species diagnosis on my many samples.
Wow, you have some serious knowledge about trilobites! Very impressive! And yea, I agree I think once you get down to identifying trilobites by order or more specific than order, it gets super difficult because of different sources using different naming systems as well as some of the groups being somewhat wastebaskets. I guess one thing is for sure, the trilobites were INCREDIBLY diverse and dominant creatures during their time! Thanks for sharing, I appreciate the clarifications and extra information as I am sure many of the people watching this video do :D
@@GEOGIRL Hi, thanks for the reply. I find myself in that position of blurring genera and loosely labelling. For instance Crotalocephalus versus
Crotalocephalina; Treveropyge versus Coltraneia; Proetus versus Gerastos; labelling Moroccan trilobites as Gerastos granulosus rather than G. tuberculatus (G. granulosus is not found in Morocco, as far as I've researched). In my early collecting days I was very trusting and believed whatever eBay sellers said taxonomically speaking, so I labelled my acquisitions as they had been described at sale time. It's been a hard habit to break since then.
@@bikkies Back when I took paleontology, my professor told us that the ones labeled as 'Moroccan' are often fake and they are being sold by scammers. But I don't think that applies to all of them. Just thought I would caution you about that haha! Although you seem as though you have enough knowledge to know what is a trilobite scam and what is not :)
@@GEOGIRL Yes, I fell into that trap. I'm still too trusting but as they say, if something looks too good to be true, it probably isn't. Generally nowadays I'm a little more wary. If a specimen is super smooth and detailed it's probably either over-prepped (excess filler or other reconstruction work) or is a replica. As many have observed, a cracked fossil is a more credible one, so that applies too. For common trilobites such as Phacops sp, Elrathia sp or Hollardops sp, they are so prolific and are so cheap that I'm not too worried about forgeries. However if it is a very spiny or otherwise exotic one, I'm more wary. I buck the trend though. Whereas many like ultra exotic genera, one of my favourites is the simple and blind Ellipsocephalus hoffi and others with a similarly basic body plan. E. hoffi is adorable, in plentiful supply, seems to be rarely faked and, I believe, has achieved index fossil status.
Thank you geo girl ❤ I am from India I am student of geology ( BSC)
I have an emotional support trilobite, named Trillian. She's awesome.
Is she living? Cause you might be famous if so😂
@@GEOGIRL only in my dreams :)
Thank you for going to the work of highlighting areas on diagrams (a lot of work for the detailed trilobites diagram, it looks like!)
Of course, so glad you found it helpful! ;)
my friends who are also interested in trilobites often making jokes about their indomitabilily, especially the order of Proetida. They were saying that the trilobites dominated the early Cambrian, showed middle finger to the Late Devonian Extinction, strived for another 100 million years and rather to end themselves along with the Era of Paleozoic.
Thank you ma'am !!
Love you from India 🇮🇳
Of course, thank you! ;D
Trilobites are great I saw the fossils as a child and thought they looked kind of a science fiction creature. Completely off topic but tangential to your presentation, pyga, as you say Latin for the butt, there was a form of divination called pygomancy, predicting the future by study of the buttocks. Different from looking at tea leaves. Best and most informative source on trilobites I have encountered. Never found a fossil of one myself, unfortunately, maybe one day
very comprehensive. thanks, from central America. =D
You are so welcome! And yay! I don't think I am have a commenter from central America yet, so welcome! So glad you liked the video ;)
Thanks for your efforts 🙂🙂🙂
You're welcome, hope it helps! ;)
so nicely explained i never learned in such way
Thank you! I am so glad you found this video helpful! ;)
Ohhh Great Finally arrived!!!
Haha Yes! Hope you like it! :D
I don't know what I was doing when this came out... how did I miss it?!?
Yes! My Professor loved to quiz us on Trilobita Suborders!! But then College was over 33 years ago for me (Old Fart!), and I barely remember. So thanks for the exciting refresher!! :D
Even though I was considered "cool" (I Lead a Rock Band in the 80's and 90's), I always nerd out over these guys!! :P
They're the only Fossils that I spent money on. One or two take turns sitting on my Desk!!
Less informed people love to say that they're just another "failure of evolution"....
I ask them to name ANY Multicellular Species that outlived the little Arthropods... Sponges and Jellies are IT! (Although I get a chuckle when some Asshat says "T-Rex")!!! LMAO 🤣 😆 😂
Beautifully presented! Have you ever given your name? One of two things I've always done, is guess someone's name, simply based on looks and personality. With You, I'd guess "Piper" or "Caitlin". I'm SURE I'm wrong, but I base that on your natural beauty and your bubbly personality, tempered with very high intelligence and passion for Science! ;)
Although I'm pretty sure I'm wrong this time, I'm glad I found your channel!!
..... oh, and WAY back in College, I loved telling girls that they had a "nice Ostracod"!!! :P
It only got me in trouble with Paleontology students...
DATED a couple of them because of that too! ;) LOL 😆
GAWD I miss the 80's.
.... at one time, I actually wanted to name our Band "Trouble with Trilobites"! :)
I have a small fossil trilobite that I bought decades ago... I am organizing my collection and would like to identify this by class/ order. But since I don't know where it was found ( geological age) I have little to go by. The body looks like Phacops, but it doesn't have the knobby head or compound eyes. Neither books or the Internet has helped.
I have a trilobite that needs to be figured out out as it don’t look like anything you have shown
The story of trilobites ended along with the era of Paleozoic. Maybe they were just some passersby of the ancient life history, an ordinary family thats ordinary enough can sometimes only be seen as backgrounds or nobody in some documentaries... but luckily the geosphere is able to record the whole process of their abundances and failures. and maybe that's the reason why I've found paleontology a little more intriguing.
From the video's ... well, *thumbnail*, I totally thought those were fingernails, which would be perfect if you're one to style your nails! Plus, there are 12 orders, which is perfect if you happen to have 12 fingers!
perfect style of explanation ❤️ ❤️ ❤️
from pakistan 🇵🇰
Thanks so much, means so much you found it helpful! ;D
Mam could you please make a playlist on paleobotany and plant fossils?
That's an amazing idea, thanks! I will work on it ;D
The webcomic xkcd number 2823 has a little bit on trilobites.
👍
Awesome video, fully cover all trilobites systematic....could you plz attach the presentation as pdf
Hi thanks, I am glad you like the video! You can check out the slides at my instagram @geogirl_gram!
Hey, thanks for all the info, great videos!
Is there any chance you could take a look at satellite imagery of Volcán Peña Blanca in Chile and let me know your thoughts on the very trilobite-like structure on its southern face? Like, from a geological standpoint, how might it have formed--especially its "eyeball"? And, from a trilobite standpoint, how similar/dissimilar are its features? If I were to suggest it to have nearly every morphological characteristic of a trilobite, would this be an invalid assessment in your expert opinion? If it does have most traits, could it suggest the Earth to be capable of forming complex structures by current flows that maybe have been classified as a fossil due to their size but would be classified as geological on the scale of this mountain?
I know, I'm out there. Thanks for humoring me if you read that and especially if you check it out! Also, thanks again for the videos! Seriously excellent work.
I saw a cloud that looks like a trilobite, is it a real trilobite? Do cloud trilobites exist? Why are scientists covering up the existence of the cloud trilobites?
"Cute name for butt" , "cute nose"; and I start thinking "bedroom full of plush toys/stuffed animals?" Not that that's a bad thing. Good info dump, btw.
I love trilobite their eyes are made of this calcite and resemble the modern bee 🐝 eyes 👀 and dragonfly and they would curl up into balls for protection
I know trilobite eyes are so impressive! As well as their rolly polly abilities ;)
I'm honestly surprised with how long they existed they never were able to go on land it's not the first time in the age of visible life were they animal's did a switch
Sea roaches 🥰 RIP doe... Gone too soon 😔
What is this
No pressure, but if you’d like to have an easier time with these names, teaching yourself how to pronounce classical Greek and Latin will cover like 80-85% of them. Just the pronunciation takes a lot less effort than trying to learn the language itself (speaking as someone who’s learned a few languages and has taught himself to pronounce Welsh).
too much information.....brain is full, must sleep to recover...
I can 100% relate to this feeling 🤣
I have a trilobite that needs to be looked at as it don’t look like any that you have shown or talked about
What a geek 😂
I have a trilobite that needs to be figured out as it don’t look like anything you have shown
I have a trilobite that needs to be figured out out as it don’t look like anything you have shown
Same here! I am trying to identify it.