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The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period) and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out.
Olenelloides armatus is an extinct, small sized (about 1 centimetre or 0.39 inches long) olenelloid redlichiid trilobite arthropod.It lived during the later part of the Botomian stage, [1] which lasted from approximately 524 to 518.5 million years ago.
As with most early trilobites, the Olenelloidea have an almost flat exoskeleton, that is only thinly calcified, and has crescent-shaped eye ridges. As part of the Olenellina suborder, the Olenelloidea lack dorsal sutures. The superfamily can be distinguished from all other Olenellina by features of the cephalon and in particular the glabella ...
Asaphiscus wheeleri, a trilobite from the Cambrian Wheeler shale of Utah. This list of trilobites is a comprehensive listing of all genera that have ever been included in the Arthropod class Trilobita, excluding purely vernacular terms.
Eoredlichia is an extinct genus of trilobite of average to large size (up to 12 centimetres or 4.7 inches long, or 20 centimetres or 7.9 inches when including the spine on the ninth thorax segment pointing horizontally to the back, that itself equals the main body length).
Encrinuridae is a family of trilobite within the order Phacopida that lived in what would be Africa, Asia, Australia, Europe, North America, and South America from the middle Ordovician to the early Devonian from , existing for approximately 66.7 million years.
Gerastos is a genus of proetid trilobite in the family Proetidae that lived between the Pragian and Eifelian of the Lower-Middle Devonian, spanning approximately 21 million years. [2] It was described by Goldfuss in 1843. [2]
Thysanopeltis is a genus of trilobite that lived from the Early to the Middle Devonian. Its remains have been found in Africa and Europe. References