The dinosaurs in Nemegtosauridae were formerly of uncertain placement in either Titanosauridae (now Titanosauria) or Diplodocoidea, as they shared features with both groups of sauropods. More recently, they have been more definitively assigned as titanosaurs. Not all scientists think Nemegtosauridae is a true natural grouping.
Being sauropods, nemegtosaurids are Water Dinosaurs.
- Ampelosaurus atacis (possible, titanosaur but placement uncertain)