|Named By:||K. T. Smith & M. C. Buchy in 2008|
|Time Period:||Late Cretaceous, 100 Ma|
|Location:||Mexico - Agua Nueva Formation|
|Size:||Uncertain, but the rear portion of the post cranial skeleton is 2 meters long, suggesting a small to medium size for this mosasaur|
|Fossil(s):||Rear half of the post cranial skeleton|
|Classification:||| Chordata | Reptilia | Squamata | Mosasauroidea ||
Vallecillosaurus is an extinct genus of mosasauroid from the Late Cretaceous period, that lived in Mexico, in the state of Nuevo Leon.