Lapparentosaurus

Name: Lapparentosaurus.
Phonetic: Lap-pa-ren-toe-sore-us.
Named By: Jose F.‭ ‬Bonaparte‭ ‬-‭ ‬1986.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropoda.
Species: L.‭ ‬madagascariensis‭ (‬type‭)‬.
Diet: Herbivore.
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.

       The type fossil material was originally assigned to the sauropod genus Bothriospondylus.‭ ‬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 genus‭; ‬Lapparentosaurus.
       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)‬.

Further reading
-‭ ‬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.



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