Genus: Vallecillosaurus SMITH & BUCHY, 2008
= Genus: Nova BUCHY, SMITH, FREY, STINNESBECK, GONZALEZ, IFRIM, LOPEZ-OLIVIA & PORRAS-MUZQUIZ, 2004
Etymology: After the village of Vallecillo, Nuevo Leon State, Mexico, where the quarrymen live who unearthed the specimen, and Greek, sauros, 'lizard'.
Species: donrobertoi SMITH & BUCHY, 2008
Etymology: In honor of Don Roberto Gonzales Vasquez, the quarry owner who preserved the specimen and kindly donated it to the UANL-FCt.
Holotype: UANL-FCT-R27 ("Pablo")
Locality: Commercial quarry near Vallecillo, Nuevo Leon State, Mexico.
Horizon: Agua Nueva Formation.
Age: Early Turonian Stage, Uppermost Gallic Subepoch, Lower Gulf Epoch, Late Cretaceous.
Material: Partial postcranial skeleton with integumentary structures on the tail and abdomen.