Domain: Eukarya

 Quetzalcoatlus northropi in the domain Eukarya because its cells contain a nucleus and other membrane bound structures (organelles).

 Kingdom: Animal

 Q. northropi is in the animal kingdom because it is a multicellular organism that is heterotrophic and reproduces sexually.

 Phylum: Chordata

 All chordates have the following features at some point in their life; pharyngeal slits, dorsal nerve cord, notochord, and post-anal tail (Berkeley.edu, 2006).

Class: Sauropsida

 Sauropsida includes most reptiles, birds, and dinosaurs, one characteristic that makes Q. northropi fall into this class is that it is cold blooded.

 Order: Pterosauria

 Pterosaurs were most closely related to the dinosaurs and all possessed the character of flight (Pterosaur.net, 2013).

 Family: Azhdarchidae

 Azhdarchidae were toothless and became well adapted to terrestrial locomotion and were normally omnivorous (The Speculative Dinosaur Project: Azhdarchidae, 2013).

 Genus: Quetzalcoatlus

 Named after the Mesoamerican feathered serpent god Quetzocoatl (The God of the Skies, 2013).

Species: northropi

 The larger of the two species in the Quetzalcoatlus genus, its counterpart Quetzalcoatlus sp. was found to have a much smaller wingspan and weight (Kellner and Langston, 1996).