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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.
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.
Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event. Asaphiscus wheeleri, a Cambrian trilobite of the Superfamily Ptychoparioidea
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
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Acernaspis is an extinct genus of trilobite that is known from the Silurian.It contains two species, A. elliptifrons, and A. salmoensis.It is sometimes found preserved in burrows of various forms, sometimes in association with multiple moults, suggesting that it used tunnels as refuges whilst in its vulnerable moulting stage.
Corynexochida is an order of trilobite that lived from the Lower Cambrian to the Late Devonian. Like many of the other trilobite orders, Corynexochida contains many species with widespread characteristics. The middle region of the cephalon (the glabella) is typically elongate, with the sides often spreading forward (pestle-shaped).