Eumorsea pinaleno is a species of grasshopper in the family Eumastacidae. It is endemic to the Arizona in the United States, where it is likely restricted to the Pinaleno Mountains. It is known commonly as the Pinaleno monkey grasshopper.Eumorsea pinaleno. Heritage Data Management System, Arizona Game and Fish Department, Phoenix, Arizona. 2001.

This grasshopper has an elongated body 8 to 24 millimeters long and long legs. It has no wings. Little is known about the biology of the species.

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