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.
Isotelus
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Isotelus is an extinct genus of large asaphid trilobites from the Middle and Late Ordovician period, fairly common in the northeastern United States into eastern Canada. Isotelus is the state fossil o
Isotelus rex , Royal Tyrrell Museum, Drumheller, Alberta, 2025 07 13
Isotelus Solo Reconstruction
Specimen of Isotelus maximus preserving the legs and portions of the gills, as described by Walcott. The specimen does not preserve the test, and an illustration of the dorsal shell is presented with the Ohio specimen underneath it.
Enrolled specimen of Isotelus maximus