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Modocia Modocia is a genus of trilobite often considered synonymous with Marjumiidae. Its remains have only been found in Utah.

Distribution
Modocia has occurred most commonly in the Wheeler formation with some found in the Marjum and Weeks formation. It is a genus of the middle Cambrian of the United States.

Description
Modocia is a genus of trilobite very similar to Marjumia except for its well developed border spines on its pydgium. Modocia is a genus of trilobite within the family Marjumiidae, a Cambrian group distributed in the strata of Laurentia. Many researchers believe that Modocia should be synonymous with Marjumia, but the border spines on the pydgium on Modocia give us reason to believe that Modocia is a separate genus. Modocia has over 25 named species of which at least seven occur in the Wheeler, Marjum, and Weeks formation.