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====Carboniferous and Permian==== The [[Proetida]], the only trilobite order to survive the end of the Devonian, continued through the [[Carboniferous]] period and lasted until the end of the [[Permian]] (when [[Permian–Triassic extinction event|the vast majority of species on Earth were wiped out]]).<ref name="Clarkson98" /> Proetids are generally morphologically homogeneous (similar to each other), having a generally conservative bodyform,<ref name=":2">{{Cite journal |last1=Hopkins |first1=Melanie J. |last2=Wagner |first2=Peter J. |last3=Jordan |first3=Katherine J. |date=2023-04-17 |title=Permian trilobites and the applicability of the "living fossil" concept to extinct clades |journal=Frontiers in Ecology and Evolution |volume=11 |doi=10.3389/fevo.2023.1166126 |doi-access=free |issn=2296-701X}}</ref> and were probably all predators or scavengers. Trilobites rapidly diversified during the earliest Carboniferous ([[Tournaisian|Tournasian]]), reaching diversity levels unseen since prior to the Taghanic event, though most of this diversification was of the family [[Phillipsiidae]], with other trilobite families barely rebounding. During the [[Serpukhovian]] at the end of the Early Carboniferous, trilobite diversity again strongly declined, and trilobite diversity remained stagnantly low throughout the late Carboniferous. Trilobite diversity may have been have been effected by ecological changes during the Carboniferous, such as the rise of [[durophagous]] fish with crushing mouthparts.<ref name=":0" /> By the end of the Carboniferous, the diversity of trilobites had dropped to only 1.8-2.2% (around 7 genera<ref name=":1">{{Cite journal |last=Brezinski |first=David K. |date=January 2023 |title=Biogeographic patterns in Late Paleozoic trilobites |url=https://linkinghub.elsevier.com/retrieve/pii/S0031018222004904 |journal=Palaeogeography, Palaeoclimatology, Palaeoecology |language=en |volume=609 |pages=111319 |bibcode=2023PPP...60911319B |doi=10.1016/j.palaeo.2022.111319}}</ref>) of the peak diversity it had had during the early Paleozoic, with this low diversity continuing into the Permian. During the Permian period, while trilobites were widespread and occurred in a variety of environments, they were typically rare components of local faunas, in sharp contrast to their often great abundance earlier in the Paleozoic.<ref name=":2" /> Permian trilobite diversity reached a peak during the [[Guadalupian]] with diversity sharply dropping by the beginning of the following [[Lopingian]].<ref>{{Citation |last1=Lerosey-Aubril |first1=Rudy |title=Quantitative Approach to Diversity and Decline in Late Palaeozoic Trilobites |date=2012 |work=Earth and Life |pages=535–555 |url=https://doi.org/10.1007/978-90-481-3428-1_16 |access-date=2025-03-16 |place=Dordrecht |publisher=Springer Netherlands |isbn=978-90-481-3427-4 |last2=Feist |first2=Raimund|doi=10.1007/978-90-481-3428-1_16 }}</ref> Some of the genera of trilobites during the Carboniferous and Permian periods include:<ref name="PREHISTORIC LIFE" /> *''[[Archegonus]] ''(Early to Middle Carboniferous) *''[[Hesslerides]]'' (Middle Carboniferous) *''[[Endops]]'' ([[Guadalupian|Middle Permian]]) *''[[Triproetus]]'' (Late Carboniferous to [[Cisuralian|Early Permian]]) *''[[Ditomopyge]] ''(Late Carboniferous to Late Permian) *''[[Pseudophillipsia]] ''(Late Carboniferous to Late Permian)
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