Trilobite
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Trilobites are extinct marine arthropods that form the class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most successful of all early
Redlichiida, such as this Paradoxides, may represent the ancestral trilobites.
Fossil Prochuangia from the Cambrian period of Darnjal Formation, Tabas, Iran
Meroperix, from the Silurian of Wisconsin
Walliserops trifurcatus, from Jebel Oufatene mountain near Fezzou, Morocco
Bumastus
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Bumastus is an extinct genus of corynexochid trilobites which existed from the Early Ordovician period to the Late Silurian period. They were relatively large trilobites, reaching a length of 6 in. Th
Bumastus barriensis, from the Silurian Wenlock series, found at Dudley, Worcestershire.
An artist's reconstruction of several individuals of Bumastus in shallow water. Bumastus were believed to have burrowed backwards into the sediment, leaving only their well-developed compound eyes exposed.
Bumastus niagarensis from Wauwatosa, Wisconsin, has a more pointed pygidium.