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ADEOPAPPOSAURUS

a massospondylid sauropodomorph dinosaur from the Early Cretaceous of Argentina.
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Pronunciation: ah-dee-o-pah-po-sor-us
Meaning: Far-eating lizard
Author/s: Martínez (2009)
Synonyms: None known
First Discovery: San Juan, Argentina
Chart Position: 558

Adeopapposaurus mognai

South America's Adeopapposaurus is very similar to South Africa's Massospondylus and when its remains were first described in 1999 that's exactly where they were assigned. A decade later Ricardo Martínez revisited its fossils and noticed things he hadn't before, like weird features of the jaw and an extra neck vertebrae, and realised he had a new dinosaur on his hands. New features or not, it's still closely related to Massospondylus and therefore a member of Massospondylidae—a family of basal sauropodomorphs (aka prosauropods) that paleontologists had long suspected of omnivory or even carnivory.

Scrutiny of its snout-end revealed an "overbite", meaning its lower jaw was shorter than its upper jaw, and it sported a series of bony ridges and hollows which could be interpreted as anchor points for fleshy lips if dinosaurs were well endowed in the facial muscle department. But we don't know if they were. Overbites are not uncommon in the animal kingdom, especially among birds of prey whose upper jaw is tipped with a hook-over beak that wont allow the lower jaw to extend further. So its likely that the snout of Adeopapposaurus anchored a beak too, but it was wide and bill-like for snipping vegetation rather than sharp and pointy for tearing at flesh.

(Far-eating lizard from Mogna)Etymology
Adeopapposaurus is derived from the Latin "adeo" (far) and "pappo" (eating), and the Greek "sauros" (lizard), in reference to a long neck which facilitated the browsing of areas far from its body. The species epithet, mognai, refers to the Mogna locality where it was found.
Discovery
The remains of Adeopapposaurus were discovered at Sierra de Mogna in the Upper Pelitic Member of the Cañón del Colorado Formation at San Juan Province, Argentina.
The holotype (PVSJ610) includes most of a skeleton from the hips up, including a skull.
Estimations
Timeline:
Era: Mesozoic
Epoch: Early Jurassic
Stage: Hettangian-Toarcian
Age range: 199-176 mya
Stats:
Est. max. length: 3 meters
Est. max. hip height: ?
Est. max. weight: 80 Kg
Diet: Herbivore
Family Tree:
Dinosauria
Saurischia
Sauropodomorpha
Massospondylidae
Adeopapposaurus
mognai
References
• Martínez, R. N. (1999a) "The first South American record of Massospondylus (Dinosauria: Sauropodomorpha)". Journal of Vertebrate Paleontology 19(Supplement) 3:61A.
• Martínez, Ricardo N. (2009) "Adeopapposaurus mognai, (Dinosauria: Sauropodomorpha), with comments on adaptations of basal sauropodomorpha".
• G.S. Paul (2010) "The Princeton Field Guide to Dinosaurs".
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To cite this page:
Atkinson, L. "ADEOPAPPOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 22nd Oct 2017.
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