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Temporal range: Bajocian-Bathonian
~168–165 Ma
Bothriospondylus madagascariensis caudal vertebrae.jpg
Tail vertebrae
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Suborder: Sauropodomorpha
Clade: Sauropoda
Clade: Eusauropoda
Genus: Lapparentosaurus
Bonaparte 1986
L. madagascariensis
Binomial name
Lapparentosaurus madagascariensis
Bonaparte 1986

Lapparentosaurus is a genus of sauropod dinosaur from the Middle Jurassic. Its fossils were found in Madagascar.

Discovery and naming[edit]

In 1895 Richard Lydekker named a new species of Bothriospondylus, B. madagascariensis based on fossils found before 1894 by J.T. Last in the Majunga Basin in layers of the Bathonian, the Isalo III Formation.[1] Because there was no real connection with this English form, in 1986 José Fernando Bonaparte named a separate genus.[2] The type species, the only known, is Lapparentosaurus madagascariensis. The generic name honours Albert-Félix de Lapparent. The holotype assigned by Bonaparte, MAA 91-92, consists of two neural arches. Much more abundant material has been referred, from at least three but perhaps as much as ten individuals from different growth stages. This includes vertebrae and limb elements but no skulls. The species is still lacking a good description and diagnosis. It should not be confused with ?Bothriospondylus madagascariensis, a distinct taxon now named Vouivria.

Age determination studies performed using growth ring counts suggest that this sauropod took 31–45 years to reach sexual maturity[3] and was relatively fast-growing given the presence of a large amount of fibrolamellar bone.[4]


The phylogenetic position of Lapparentosaurus was long poorly understood. It exhibits an unusual combination of characters of both basal and derived sauropods.[5] It has been classified as a brachiosaurid or an indeterminate titanosauriform.[5] However, recent phylogenetic analyses have shown it to be a basal eusauropod, not closely related to brachiosaurids at all.[6]











  1. ^ Lydekker, R. (1895). "On bones of a sauropodous dinosaur from Madagascar". Quarterly Journal of the Geological Society of London. 51: 329–336. doi:10.1144/gsl.jgs.1895.051.01-04.25.
  2. ^ Bonaparte, J.F. (1986). "Les dinosaures (Carnosaures, Allosauridés, Sauropodes, Cétosauridés) du Jurassique Moyen de Cerro Cóndor (Chubut, Argentina)". Annales de Paléontologie (Vert.-Invert.). 72 (3): 325–386.
  3. ^ de, Ricqlès (1983). "Cyclical growth in the long bones of a sauropod dinosaur". Acta Palaeontologica Polonica. 28: 225–232.
  4. ^ Rimblot-Baly, F.; de Ricqlès, A.; Zylberberg, L. (1995). "Analyse paléohistologique d'une série de croissance partielle chez Lapparentosaurus madagascariensis (Jurassique Moyen): essai sur la dynamique de croissance d'un dinosaure sauropode". Annales de Paléontologie. 81: 49–86.
  5. ^ a b Upchurch, Paul; Barrett, Paul M.; Dodson, Peter (2004). "Sauropoda". In Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (eds.). The Dinosauria (2nd ed.). University of California Press. ISBN 0520254082.
  6. ^ Royo-Torres, Rafael; Upchurch, Paul; Kirkland, James I.; DeBlieux, Donald D.; Foster, John R.; Cobos, Alberto; Acalá, Luis (2017). "Descendants of the Jurassic turiasaurs from Iberia found refuge in the Early Cretaceous of western USA". Scientific Reports. 7. doi:10.1038/s41598-017-14677-2. PMC 5662694. PMID 29085006.