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Lognkosaurians; Temporal range: Early-Late Cretaceous, 132.9–70.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Replica mount of Futalognkosaurus at the Royal Ontario Museum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	†Sauropodomorpha
Clade:	†Sauropoda
Clade:	†Macronaria
Clade:	†Titanosauria
Clade:	†Colossosauria
Clade:	†Lognkosauria; Calvo et al. 2007
Genera
	Argentinosaurus; Drusilasaura; Dzharatitanis?; Futalognkosaurus; Jiangxititan; Mendozasaurus; Notocolossus; Patagotitan; Puertasaurus; Traukutitan?;

Lognkosauria is a clade of giant long-necked sauropod dinosaurs within the clade Titanosauria. It includes some of the largest and heaviest dinosaurs known. They lived in South America and likely Asia during the Late Cretaceous period.

Description

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 vaulted neural 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 from Malawisaurus, the sister taxon to Lognkosauria, indicates that lognkosaurians at least began with the big-nosed, rounded head shape of earlier titanosaurs and more basal macronarians.^[5]

Classification

Lognkosauria was defined as the clade encompassing the most recent common ancestor of Futalognkosaurus dukei and Mendozasaurus neguyelap and all its descendants. Malawisaurus may be related to this group.^[4] Lognkosauria has been found to include other giant sauropods, such as Puertasaurus, Argentinosaurus, Patagotitan, Notocolossus, Drusilasaura and Traukutitan.^[6]^[7]^[8]^[9]^[10]

	Aeolosaurus

	Overosaurus

Bonitasaura

Notocolossus

Lognkosauria

Mendozasaurus

	Futalognkosaurus

	Quetecsaurus

Puertasaurus

Drusilasaura

	Argentinosaurus

	Patagotitan

References

^ Mo, Jin-You; Fu, Qiong-Yao; Yu, Yi-Lun; Xu, Xing (2023-09-21). "A New Titanosaurian Sauropod from the Upper Cretaceous of Jiangxi Province, Southern China". Historical Biology: 1–15. doi:10.1080/08912963.2023.2259413. ISSN 0891-2963.
^ 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. ISBN 978-3-030-95958-6. ISSN 2197-9596.
^ 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. ISBN 978-3-030-95958-6. ISSN 2197-9596.
^ ^a ^b Calvo, J. O.; Porfiri, J. D.; González-Riga, B. J.; Kellner, A. W. (2007). "A new Cretaceous terrestrial ecosystem from Gondwana with the description of a new sauropod dinosaur". Anais da Academia Brasileira de Ciências. 79 (3): 529–41. doi:10.1590/s0001-37652007000300013. PMID 17768539.
^ Silva, J.C.G. Jr.; Marinho, T.S.; Martinelli, A.G.; Langer, M.C. (2019). "Osteology and systematics of Uberabatitan ribeiroi (Dinosauria; Sauropoda): a Late Cretaceous titanosaur from Minas Gerais, Brazil". Zootaxa. 4577 (3): 401–438. doi:10.11646/zootaxa.4577.3.1.
^ Calvo, J. O.; Porfiri, J. D.; González Riga, B. J.; Kellner, A. W. A. (2007). "Anatomy of Futalognkosaurus dukei Calvo, Porfiri, González Riga, & Kellner, 2007 (Dinosauria, Titanosauridae) from the Neuquen Group, Late Cretaceous, Patagonia, Argentina" (PDF). Arquivos do Museu Nacional. 65 (4): 511–526. Archived from the original (PDF) on 2011-07-13.
^ José L. Carballido; Diego Pol; Alejandro Otero; Ignacio A. Cerda; Leonardo Salgado; Alberto C. Garrido; Jahandar Ramezani; Néstor R. Cúneo; Javier M. Krause (2017). "A new giant titanosaur sheds light on body mass evolution among sauropod dinosaurs". Proceedings of the Royal Society B: Biological Sciences. 284 (1860): 20171219. doi:10.1098/rspb.2017.1219. PMC 5563814. PMID 28794222.
^ Juárez Valieri, Rubén D.; Calvo, Jorge O. (2011). "Revision of MUCPv 204, a Senonian Basal Titanosaur from Northern Patagonia" (PDF). Paleontología y dinosarios desde América Latina: 143–152. Archived from the original (PDF) on 2011-07-06.
^ Navarrete, César; Casal, Gabriel; Martínez, Rubén (2011). "Drusilasaura deseadensis gen. et sp. nov., a new titanosaur (Dinosauria-Sauropoda), of the Bajo Barreal Formation, Upper Cretaceous of north of Santa Cruz, Argentina". Revista Brasileira de Paleontologia. 14 (1): 1–14. doi:10.4072/rbp.2011.1.01.
^ 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 dinosaur Mendozasaurus neguyelap: implications for basal titanosaur relationships". Zoological Journal of the Linnean Society. 184: 136–181. doi:10.1093/zoolinnean/zlx103. hdl:10044/1/53967.