Jainosaurus is a genus of titanosaurian sauropoddinosaur of India and wider Asia, which lived in the Maastrichtian. A herbivorousquadruped, an adult Jainosaurus would have measured around eighteen metres long and held its head six metres high. No accurate estimate of the weight has yet been made. The humerus of the type specimen is 134 centimetres long.
Etymology
The specific name of J. septentrionalis means "northern" in Latin, a reference to the fact that the species was discovered on the Northern hemisphere whereas Antarctosaurus means "saurian from the Southern hemisphere" because its type speciesAntarctosaurus wichmannianus was found in Argentina. The generic name honours the Indian paleontologist Sohan Lal Jain, who worked on the cranial nerve impressions in the skull; and in 1982 published a study about the results. Ironically, Jain himself considered the remains synonymous with Titanosaurus in the 1997 description of Isisaurus. However, Wilson and Upchurch rejected the synonymy of Jainosaurus and Titanosaurus due to the dubious status of the latter.
History
The type species of Jainosaurus, J. septentrionalis has a long and complex taxonomic history closely connected to the history of the problematic generaTitanosaurus and Antarctosaurus. The first remains were between 1917 and 1920 found by Charles Alfred Matley near Jabalpur in the Lameta Formation. These were named Antarctosaurus septentrionalis by Friedrich von Huene and Matley in 1933. In 1995Adrian Paul Huntet al., believing Antarctosaurus to belong to Dicraeosauridae, made the clearly titanosaurian Antarctosaurus septentrionalis the type species of a new genus, Jainosaurus, and determined that the braincase, GSI IM K27/497, should be the lectotype. Jainosaurus was further distinguished from Antarctosaurus by details of the braincase. In 2009, Jeffrey Wilson and others made a detailed reassessment of Jainosaurus septentrionalis and confirmed its validity. The postcrania, which had been assumed lost, were shown to be largely present in the collection of the Geological Survey of India at Calcutta. They include: dorsal rib fragments ; a caudal vertebra, four chevrons, the left and right scapula ; a sternal plate ; a humerus, a radius and an ulna. In 1996 Sankar Chatterjee referred a second braincase to the species: ISI R162. Some material from Pakistan also possibly belongs toJainosaurus. Wilson e.a. concluded that Jainosaurus is a valid taxon, clearly distinguishable from Isisaurus. It would have been a fairly derived member of the Titanosauria, more closely related to South-American forms like Pitekunsaurus, Muyelensaurus and Antarctosaurus than to Isisaurus or Rapetosaurus.
