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Limaysaurus skeletal



My first diplodocoid skeletal. I believe this may be the only (and first?) multi-view skeletal of a rebbachisaur on the internet (I'm sure that won't last long...). Rebbachisaurs are my other favorite group of sauropods, along the titanosaurs. They are fairly poorly known, with the most complete species, Limaysaurus and Nigersaurus (both known from multiple skeletons that are fairly complete) badly in need of a monographic treatment.

The vital statistics (locality, age, length, mass, etc.) are included in the image this time. As always, in the lateral (side) view, the undescribed or missing material is shown in dark gray, while known material is shown in white. Missing material was borrowed from Amazonsaurus, Zapalasaurus, Comahuesaurus, Demandasaurus, Nigersaurus and Tataouinea -- all of which are rebbachisaurids or rebbachisaur-grade diplodocoids. Therefore this skeletal is not as accurate as I would like, and will likely need to be revised in the future.

Another problem I encountered is that, as far as I can tell, most measurements for the material of Limaysaurus are not listed in the literature (excluding the appendicular elements), therefore this skeletal was based largely off of scale bars, which are not very reliable (generally speaking). However, I was surprised at how similar the proportions were to skeletals of Nigersaurus by Scott Hartman and Mike Hanson that are available online, so the scale bars may have been more accurate in this case than I have found when doing other sauropods (*ahem*...Futalognkosaurus...*cough* *cough*....). So I fairly confident in the general proportions and size estimates, even though the details will most certainly need some ironing out in the future.

All-said-and-done, Limaysaurus was a small medium-sized sauropod, short-necked, with tall dorsal neural spines (that of Rebbachisaurus are even taller proportionally), and had a more traditional 'sail-backed' look than most other sauropods. The skull is less Nigersaurus-like and more like Demandasaurus due to the fact that Nigersaurus very derived and probably had a highly autapomorphic skull.

References consulted--

Carvalho IDS, Avilla DSL, Salgado L. 2003. Amazonsaurus maranhensis gen. et sp. nov. (Sauropoda, Diplodocoidea) from the Lower Cretaceous (Aptian–Albian) of Brazil. Cretaceous Res. 24(6):697–713.

Apesteguıa S, Gallina PA, Haluza A. 2010. Not just a pretty face: anatomical peculiarities in the postcranium of rebbachisaurids (Sauropoda: Diplodocoidea). Hist Biol. 22(1–3):165–174.

Calvo J, Salgado L. 1995. Rebbachisaurus tessonei sp. nov. a new Sauropoda form the Albian–Cenomanian of Argentina; new evidence on the origin of the diplodocidae. Ameghiniana. 11:13–33.

Salgado L, De Souza Carvalho I, Garrido AC. 2006. Zapalasaurus bonapartei, un nuevo dinosaurio sauropodo de La Formacion La Amarga (Cretacico Inferior), noroeste de Patagonia, Provincia de Neuquen, Argentina. Geobios. 39(5):695–707.

Salgado L, Garrido AC, Cocca JR, Cocca JR. 2004. Lower Cretaceous rebbachisaurid sauropods from the Cerro Aguada Leon (Lohan Cura Formation), Neuquen Province, Northwestern Patagonia, Argentina. J Vert Palaeontol. 24(4):903–912.

Sereno PC, Wilson JA, Witmer LM, Whitlock JA, Maga A, Ide O, Rowe TA. 2007. Structural extremes in a Cretaceous dinosaur. PLoS ONE. 2(11):e1230.

Torcida Fernandez-Baldor F, Canudo JI, Huerta P, Montero D, Pereda Suberbiola X, Salgado L. 2011. Demandasaurus darwini, a new rebbachisaurid sauropod from the Early Cretaceous of the Iberian Peninsula. Acta Palaeontol Pol. 56(3):535–552.

José Luis Carballido, Leonardo Salgado, Diego Pol, José Ignacio Canudo, Alberto Garrido. A new basal rebbachisaurid (Sauropoda, Diplodocoidea) from the Early Cretaceous of the Neuquén Basin; evolution and biogeography of the group. Historical Biology. Vol. 24, Iss. 6, 2012

Federico Fanti, Andrea Cau, Mohsen Hassine & Michela Contessi (2013). "A new sauropod dinosaur from the Early Cretaceous of Tunisia with extreme avian-like pneumatization". Nature Communications 4 (2080): 1–7
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TriceratopsHorridus's avatar

What was the density you used for this skeletal's GDI? This 6.2-6.5 tonnes seems quite a bit less than SpinoInWonderland's GDI of it, which gave 7.7 tonnes.