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ANGULOMASTACATOR

a plant-eating lambeosaurine hadrosaurid dinosaur from the Late cretaceous of North America.
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Pronunciation: an-GOO-lo-MASS-ta-CAH-tor
Meaning: Bend chewer
Author/s: Wagner and Lehman (2009)
Synonyms: None known
First Discovery: Texas, USA
Chart Position: 550

Angulomastacator daviesi

Described as enigmatic (from the Latin aenigma "riddle") due in no small part to the paucity of its remains, Angulomastacator was categorized as a head-crested-lambeosaurine despite being known solely from a wonky tooth-bearing bone from the left part of the upper jaw which is known to boffins as "the maxilla".

Its name translates as "bend chewer" and honours the Big Bend area of the Rio Grande where it was discovered. It's also a crafty reference to its boomerang-shaped jaw, complete with a closely-packed tooth-row that hugs the same 45° downwards curve from the midpoint, suggesting this was its natural shape rather than being distortion by horrendous compressive forces during the process of fossilization.

As a lambeosaur Angulamastacator would have walked on two legs, possibly dropping onto all fours for browsing. Its discovery alongside copious ammounts of fossilized clam shells and plants suggests that this particular part of the Aguja Formation—known as "the upper shale member"—was a tributary; a small stream or river that feeds a larger river of lake rather than running straight into the sea.
Etymology
Angulomastacator is derived from the Latin "Angulus" (angle), and what seems to be a mispelling of the Latin "masticator" (chewer).
The species epithet, daviesi, is named in honor of Kyle L. Davies who, in 1983 and without a shred of evidence, insisted there simply must be lambeosaurine material present in the Aguja Formation.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 80-72 mya
Stats:
Est. max. length: 8 meters
Est. max. hip height: ?
Est. max. weight: 1.5 tons
Diet: Herbivore
References
• J.R. Horner, D.B. Weishampel and C.A. Forster (2004) "Hadrosauridae" in Weishampel, Dodson and Osmólska (eds.) "The Dinosauria: Second edition".
• J.R. Wagner and T.M. Lehman (2009) "An Enigmatic New Lambeosaurine Hadrosaur from the Upper Shale Member of the Aguja Formation, Texas".
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To cite this page:
Atkinson, L. "ANGULOMASTACATOR :: from DinoChecker's dinosaur archive".
›. Web access: 29th Mar 2017.
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