Camponotus depressus. Image courtesy April Nobile/, and shared under a Creative Commons CC-BY-SA 3.0 license. 

What was the oddly flat ant?

KMS picked up all ten points for naming Camponotus depressus, a bamboo-nesting species found in Amazonia south to Paraguay. Little research has been done on this unusual species. But, check out Davidson et al 2006:

Davidson, W.; Arias, Ja; Mann, J., 2006: An experimental study of bamboo ants in western Amazonia. Insectes Sociaux ruary; 53(1): 108-114