Longicorn from Argentina: Retrachydes thoracicus

Subject: Roach or beetle from Buenos Aires City
Location: Buenos Aires City
January 22, 2016 2:16 pm
Was walking to the store for groceries and observed this guy. Never seen one like him, weird bugs are uncommon here. What is it?
Signature: Gabriel

Longicorn: Retrachydes thoracicus
Longicorn: Retrachydes thoracicus

Dear Gabriel,
We are quite certain that if you looked a bit more closely, you would find many “weird bugs” in Buenos Aires.  This is a Longicorn or Longhorned Borer Beetle from the family Cerambycidae, and we quickly identified it as 
Retrachydes thoracicus on the Insectos de Argentina y del Mundo site.  Cerambycoidea.com indicates the species is found in:  “Brazil, Bolivia, Paraguay, Uruguay, Argentina.”  BioLib has an excellent image of a pinned specimen and Meloidae.com has several nice images of living individuals.  Beetles in the Bush indicates:  “Of course, it is a species of longhorned beetle (family Cerambycidae) that apparently is found commonly in South America.” 

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