Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Nanchangosaurus is a member of the Hupehsuchia, a group that includes the very similar Hupehsuchus. In fact, the two may be congeneric. There are a few differences between the two species. Hupehsuchus had heavier armor and more divided ridge spines than the two. Other than Hupehsuchus, there is little else known about Nanchangosaurus relatives. They have sometimes been referred to as ancestors of the ichthyosaurs, because of their streamlined shape, long jaws, and paddle-like hands, as well as the discovery of polydactyly in the fins of Hupehsuchus; just like the ichthyosaurs. However, a gap in the skulls suggests that they may be related to archosaurs instead. Some people even put them in the Eosuchia, a group of early diapsid reptiles.

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