in between 179 and 178 million years, that is Middle-Late Toarcian. Patagosaurus is almost completely known with many articulated specimens found covering almost all of the skeleton, including parts of the skull. Over twelve specimens have been referred to the species, although some of the material is probably from a unique taxon. Bonaparte (1986) assigned three specimens other than the holotype PVL 4170, PVL 4076, MACN CH 934 and MACN CH 933 to the genus. While the holotype includes a postcranial skeleton, the others are known from cranial material and a nearly complete juvenile skeleton and skull. MACN CH 933 is directly comparable with the type material of Patagosaurus, which confirms its association with the genus. A specimen first referred to Patagosaurus in 2003, MPEF-PV 1670 (which includes just a lower jaw), is also very similar to MACN CH 933, and differences can be associated with age, so therefore, MPEF-PV 1670 presumably represents adult cranial material. However, the teeth of MACN CH 934 are very different from those of both lower jaws (MACN CH 933 and MPEF-PV 1670), so it can be identified as another sauropod from the same deposit as Patagosaurus. Thus, the taxon only certainly includes PVL 4170, MACN CH 933 and MPEF-PV 1670. Description Patagosaurus is a sauropod that possessed a general and unspecialized bauplan of being quadrupedal, having an elongate neck, a small head and a very long tail. Therefore, it is similar to Cetiosaurus and other related genera, who possessed the same morphology. It has been estimated that it was about long and weighed about . An earlier estimate by John S. McIntosh and his colleagues in 1997, found that Patagosaurus was approximately long, and also in weight, similar to the later estimates by Holtz. A 2006 study by Donald M. Henderson calculated the weight of Patagosaurus to be , a smaller estimate than McIntosh's. The skull of Patagosaurus is not very well known, with a 2003 revision by Oliver Rauhut determining only a few jaws are certainly referrable to it, as opposed to nearly the entire skull. MPEF-PV 1670 shows what the morphology of the adult or subadult skull was like, while MACN CH 933 represents a juvenile individual. Based upon how broad, high and short the adult articulated mandibles of Patagosaurus are, its snout would have been short, high and broad as well, a typical feature of most sauropods. The teeth of Patagosaurus