The species lived 100 million to 95 million years ago. Some island-dwelling dwarf titanosaurs, such as Magyarosaurus, were probably the result of allopatric speciation and insular dwarfism. Within the recommended results, she only named Titanosauria, Lithostrotia, Saltasauridae, Saltasaurinae and Opisthocoelicaudiinae, because of the weakness of support (below and left). Eutitanosauria (closer to Saltasaurus than Epachthosaurus) was resolved as a very inclusive clade composed of two distinct branches, one leading to the larger-bodied lognkosaurs and the other to the smaller-bodied saltasaurs. [48], Titanosaurus indicus was first named by British paleontologist Richard Lydekker in 1877, as a new taxon of dinosaur based on two caudals and a femur collected on different occasions at the same location in India. These dinosaurs had to sustain this incredible . [38] A 2011 study by Philip Mannion and Calvo found Andesauridae to be paraphyletic (excluding some of the group's descendants) and likewise recommended its disuse. Saltasauridae was defined as a node-stem triplet, where everything descended from the common ancestor of Opisthocoelicaudia and Saltasaurus was within Saltasauridae, and the subfamilies Saltasaurinae and Opisthocoelicaudiinae were for every taxon on one branch of the saltasaurid tree or the other. (1997) as Andesaurus plus Saltasaurus. The same area is reduced in Argentinosaurus to only two ridges, and is fully absent in taxa like Opisthocoelicaudia and Saltasaurus. Argentinosaurus Was a Type of Dinosaur Known as a Titanosaur Given its gigantic size, it's appropriate that Argentinosaurus is classified as a titanosaur, the family of lightly-armored sauropods which spread to every continent on Earth later in the Cretaceous period. When it was identified as a tibia, it was thought to have a comparatively short cnemial crest, a prominent extension at the upper front that anchored muscles for stretching the leg. Following Calvo, Gonzlez-Riga and Porfiri (2007), Rinconsauria was defined as Muyelensaurus plus Rinconsaurus, and Lognkosauria was defined as Mendozasaurus plus Futalognkosaurus. This, coupled with the preservation of a single phalanx on digit IV of Epachthosaurus and potentially Opisthocoelicaudia (further study is necessary), show that preservation biases may be responsible for the lack of hand phalanges in these taxa. 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