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Although intra-species trilobite diversity seems to have peaked during the Cambrian, [30] trilobites were still active participants in the Ordovician radiation event, with a new fauna taking over from the old Cambrian one. [31] Phacopida and Trinucleioidea are characteristic forms, highly differentiated and diverse, most with uncertain ...
Olenellus is an extinct genus of redlichiid trilobites, with species of average size (about 5 centimetres or 2.0 inches long). It lived during the Botomian and Toyonian stages (Olenellus-zone), , in what is currently North-America, part of the palaeocontinent Laurentia. [4] Life reconstruction of Olenellus thompsoni
Pages in category "Trilobites of North America" The following 33 pages are in this category, out of 33 total. This list may not reflect recent changes. A.
Elrathia is a genus of trilobite belonging to Ptychopariacea known from the mid-Cambrian of Laurentia (North America). [2] E. kingii is one of the most common trilobite fossils in the USA [3] locally found in extremely high concentrations within the Wheeler Formation in the U.S. state of Utah. [4] E. kingii has been considered the most ...
Encrinurus is a long-lived genus of phacopid trilobites that lived in what are now Africa, Asia, Australia, Europe, North America, and South America from the middle Ordovician to the early Devonian from 472 to 412.3 mya, existing for approximately
Triarthrus is an average size trilobite (up to about 5 centimetres or 2.0 inches) and its moderately convex body is about twice as long as wide (excluding spines). Like in all Olenidae, the headshield (or cephalon ) of Triarthrus has opisthoparian sutures , and the right and left free cheeks that they define are yoked.
Most trilobites with this life history strategy lived in warm, low latitude waters, in which planktonic, non-adult like larvae may be ideal at surviving in. During the Ordovician-Silurian extinction event, the widespread onset of cold water conditions and anoxia may have instead favoured species that produced small numbers of large eggs, from ...
Trilobites of North America (4 C, 33 P) O. Trilobites of Oceania (2 C, 12 P) S. Trilobites of South America (3 C, 4 P) This page was last edited on 13 January 2022 ...