Monoxenus spinosus is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1939.BioLib.cz - Monoxenus spinosus. Retrieved on 8 September 2014.

It is 12 mm long and 5.5 mm wide, and its type locality is Magamba, Usambara Mountains.

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