Named By: Jose F. Bonaparte - 1986.
Synonyms: Bothriospondylus madagascariensis.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Sauropoda.
Species: L. madagascariensis (type).
Size: Uncertain but roughly estimated to be around 15 meters long.
Known locations: Madagascar - Isalo III Formation.
Time period: Bathonian of the Jurassic.
Fossil representation: Partial post cranial remains including vertebrae and limbs bones from several individuals of various sizes.
type fossil material was originally assigned to the sauropod
However, not only is Bothriospondylus considered
a dubious genus of sauropod because of the lack of identifiable
features upon the type material, but the type material came from
England, a long way from Madagascar. For this reason the
palaeontologist Jose Bonaparte renamed the Madagascan material as a new
Lapparentosaurus is represented by several individuals, though the exact number is hard to determine. However, the individuals that do represent Lapparentosaurus are of different growth stages, allowing palaeontologists to get an idea of how Lapparentosaurus grew to adulthood. There is some uncertainty about whether Lapparentosaurus was a primitive member of the macronarian sauropods or a distinct brachiosaurid. Cladistic analysis has supported the idea Lapparentosaurus was a primitive macronarian, and this also ties in to the appearance of Lapparentosaurus in the Bathonian stage of the Jurassic, roughly where we would expect primitive macronarian sauropods to be. Brachiosaurids however, while still classed as macronarians themselves, are more advanced in form and do not become common until the late Jurassic (going by brachiosaurid fossil appearances in the fossil record).
- On bones of a sauropodous dinosaur from Madagascar. - Quarterly Journal of the Geological Society of London 51: 329-336. - R. Lydekker - 1895.
The early radiation and phylogenetic relationships of the Jurassic sauropod dinosaurs, based on vertebral anatomy. The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic–Jurassic Boundary. - Cambridge University Press, Cambridge 247-258. - Jose F. Bonaparte - 1986.
- 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 - F. Rimblot-Baly, A. de Ricqlès, & L. Zylberberg - 1995.