Lognkosauria is aclade of giant long-neckedsauropoddinosaurs within thecladeTitanosauria. It includes some of the largest and heaviest dinosaurs known. They lived in South America and Asia during the Late Cretaceous period.
Lognkosaurians can be distinguished from other titanosaurs by the wide and unusually thick cervical rib loops on their neck vertebrae, the relatively narrow neural canal, and their huge vaultedneural arches. They also had very wide dorsal vertebrae with wing-like side processes, and extremely wide rib cages. Their dorsal side processes are also fairly in-line with the level of the neural canal.[4]
Skull material fromMalawisaurus, thesister taxon to Lognkosauria, indicates that lognkosaurians at least began with the big-nosed, rounded head shape of earlier titanosaurs and more basalmacronarians.[5]
^Gallina, P.A.; González Riga, B.J.; Ortiz David, L.D. (2022). "Time for Giants: Titanosaurs from the Berriasian–Santonian Age". In Otero, A.; Carballido, J.L.; Pol, D. (eds.).South American Sauropodomorph Dinosaurs. Record, Diversity and Evolution. Springer. pp. 299–340.doi:10.1007/978-3-030-95959-3.ISBN978-3-030-95958-6.ISSN2197-9596.
^Santucci, R.M.; Filippi, L.S. (2022). "Last Titans: Titanosaurs From the Campanian–Maastrichtian Age". In Otero, A.; Carballido, J.L.; Pol, D. (eds.).South American Sauropodomorph Dinosaurs. Record, Diversity and Evolution. Springer. pp. 341–391.doi:10.1007/978-3-030-95959-3.ISBN978-3-030-95958-6.ISSN2197-9596.
^Bernardo J. Gonzàlez Riga; Philip D. Mannion; Stephen F. Poropat; Leonardo D. Ortiz David; Juan Pedro Coria (2018). "Osteology of the Late Cretaceous Argentinean sauropod dinosaurMendozasaurus neguyelap: implications for basal titanosaur relationships".Zoological Journal of the Linnean Society.184:136–181.doi:10.1093/zoolinnean/zlx103.hdl:10044/1/53967.
