Scapanopygus cinereus is a species of beetle in the family Cerambycidae, the only species in the genus Scapanopygus. Both the genus and species were described in 1913 by French entomologist Pierre-Émile Gounelle. The type specimen was collected from Averías, a municipality in Argentina, on the banks of the Salado River.
In 2005, Monné and Napp transferred the genera Ranqueles and Scapanopygus to the tribe Bothriospilini based on cladistic analysis.
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