SINCE 1828
Agnostus
noun
Ag·nos·tus
| \ ag-ˈnä-stəs\
Definition of Agnostus
: a genus of small blind Cambrian and Ordovician trilobites that with a number of related forms in which the cephalon and pygidium are almost indistinguishable constitute an order (Agnostida) of highly specialized forms
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