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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: https://amzn.to/3nU0ada GEO GIRL Website: https://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! Hey there, Earth enthusiast! Check my favorite Earth-friendly products: Bamboo toilet paper: https://shrsl.com/3cvku Bamboo paper towels: https://shrsl.com/3cvkw Compostable trash bags: https://shrsl.com/3cvl0 Bamboo cutlery + straw! : https://shrsl.com/3cwfl Eco-Friendly Tote (great for grocery shopping!): https://shrsl.com/3cwfp Reusable straws + cleaning brushes (my fav!): https://shrsl.com/3cwft Eco-friendly laundry detergent: https://shrsl.com/3cwgo Directly offset your carbon footprint with Wren: https://shrsl.com/3d0t2 Tools I use as a geologist/teacher/student: Geology field notebook: https://amzn.to/3lb6dJf Geology rock hammer: https://amzn.to/3DZw8MA Geological compass: https://amzn.to/3hfbdLu Geological hand lens: https://amzn.to/3jXysM5 Camera: https://amzn.to/3l6fGRT Carbon-neutral backpack: https://shrsl.com/3cvkc Image sources: https://www.trilobites.info/ordagnost... http://www.trilobites.info/galredlich... https://www.trilobites.info/galcoryne... https://www.trilobites.info/galodonto... https://www.trilobites.info/gallichid... https://www.trilobites.info/galphacop... http://trilobites.info/galproetida.html https://trilobites.info/galasaphida.htm http://www.trilobites.info/galharpeti... http://www.trilobites.info/galptychop... 2 slide https://blogs-images.forbes.com/trevo... https://digsfossils.com/fossils/pa_mi... https://www.trilobites.info/trilomorp... http://www.trilobites.info/eyeholochr... http://www.trilobites.info/eyeschizoc... https://fr.wikipedia.org/wiki/Trilobi... http://www.fossilmall.com/Western-Fos... http://www.lifebeforethedinosaurs.com... http://www.trilobites.info/galredlich... https://www.trilobites.info/galcoryne... http://www.trilobites.info/galptychop... https://www.pinterest.fr/pin/49595897... https://www.trilobites.info/galodonto... / 458452437045872815 https://www.trilobites.info/gallichid... http://www.fossilmall.com/EDCOPE_Ente... https://fr.wikipedia.org/wiki/Trilobi... http://www.iamthedivaczt.com/2013/01/... https://www.trilobites.info/galphacop... https://www.flickr.com/photos/pcamero... http://trilobites.info/galproetida.html http://www.trilobites.info/ordproetid... https://trilobites.info/galasaphida.htm https://www.flickr.com/photos/samgon/... https://www.trilobites.info/pictrinuc... http://www.trilobites.info/galharpeti... http://www.fossilmall.com/EDCOPE_Ente... https://www.trilobites.info/galcoryne... https://www.fossilera.com/sp/20409/ru... http://taxondiversity.fieldofscience.... https://www.trilobites.info/triloclas... Disclaimer: Links in this description may be affiliate links. If you purchase a product with these links I may receive a small commission, but there is no additional charge to you! Thank you for supporting my channel!