Abstract
Agnostoid trilobites are described from Middle Cambrian sediments in the Precordillera of Mendoza and San Juan provinces. The following taxa occur at Solitario Hill, Mendoza: Clavagnostus canotensis, Tomagnostella exsculpta, Agnostus exsulatus, Agnoslus ? sp., Oedorhachis australis, Ptychagnostus aculeatus and Ammagnostus sp. Taxa from the Ojos de Agua locality in San Juan comprise: Kormagnoslus seclusus, Peronopsis tenuis and Ballagnostus ? sp. There are the first agnostoids recorded from the San Juan area. Ptychagnostus aculeatus from Mendoza is here recorded for the first time in Argentina. A late Middle Cambrian age is assigned to the strata containing the assemblages of both Mendoza and San Juan.
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