Genus: Futalognkosaurus CALVO, PORFIRI, GONZALEZ-RIGA & KELLNER, 2007
Etymology: From the Mapuche indigenous language, futa, "giant" and lognko, "chief" and Greek, sauros, "lizard."

Species: dukei CALVO, PORFIRI, GONZALEZ-RIGA & KELLNER, 2007
Etymology: In honor of the Duke Energy Argentina Company that sponsored the evcavation (2002-2003).

Note: Carl Masthay has researched the name further and here is his findings

“Futalognkosaurus . . . Mapuche [‘land-people’ in Chile and Argentina] Indian words for ‘giant’ and ‘chief’.” Because ‘giant’ is cayanchrai or cayumchroi and ‘head’ and ‘chief’ are both lonco and ‘great, big, large’ is vuta (with variants) and ‘great chief’ is vuta apo, so then vuta-lonco would properly be ‘big-head’ or ‘big-chief’ and with no “giant” meaning involved. The “v” is [f] varying to [v], and “gnk” is a misspelling for “nk.”

Holotype: MUCPv-323

Locality: Futalognko Quarry, north coast of Barreales Lake, Neuquen Province, Patagonia, Argentina.

Horizon: Portezuelo Formation, Upper Rio Neuquen Subgroup, Middle Neuquen Group.
(was Portezuelo Member, Rio Neuquen Formation.)

Biostratigraphy:

Age: Neuquenian Tetrapoda Assemblage, Upper Turonian or Coniacian Stage, Lower Senonian Subepoch, Lower Gulf Epoch, Early Late Cretaceous.

Material: Atlas, axis, 5 anterior, 4 middle, and 3 posterior cervical, 10 dorsal vertebrae, ribs, complete sacrum, both ilia, right pubis and ischium and 1 anterior caudal.