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1
A small Ordovician agnostid trilobite, Geragnostus had a nearly cosmopolitan distribution and is recognized by its short cephalon and broad pygidium.
2
A genus of very small Cambrian agnostid trilobites recognized across multiple continents, valued for fine-scale biostratigraphic subdivision of Cambrian strata.
3
A Cambrian agnostid trilobite known from multiple continents, used in biostratigraphic correlation of Middle Cambrian sequences across Gondwana and Laurentia.
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