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Found 4 results

  1. Although identification of Hadrosaurid teeth in North America is very difficult or impossible some older publications by John Horner give us some information to help us with a few. The information goes back a bit so there might be some new understanding but will share what is published. If anyone has publications that can add to the dentary information of teeth from North America please feel free to post it. Horner notes that on dentary teeth all Saurolophinae teeth have diamond-shaped crown whereas Lambeosaurinae teeth are more elongate see figure 13.4. So one may not be able to assign it to a specific genus but a Subfamily may be possible. Maxillary teeth can be different but not discussed.. Saurolophinae include: Edmontosaurus, Kritosaurus, Gryposaurus, Brachylophosaurus, Maiasaura, Brachylophoslaurus Lambeosaurinae include: Lambeosaurus, Parasaurolophus, Corythosaurus, Hypacrosaurus I would suggest that only complete teeth with fairly good preservation be used in any attempt to identify these teeth. Hell Creek & Lance Formation A publication on Edmontosaurus diversity in North America by N. Campione and D. Evans 2011 concluded that all there is only one species of hadrosaur in these faunas so all teeth found can be assigned to Edmontosaurus annectens. Judith River Formation Horner identifies dentary teeth with small denticles as Gryptosaurus (However not sure its been described from JRF so I would question this assignment) Two Medicine Formation Horner identifies dentary teeth with big denticles as Gryptosaurus latidens Horner identifies dentary teeth with very small denticles as Prosaurolophus maximus Hypacrosaurus stebingeri - The figure below shows variations with several species of dentary teeth Book: John Horner: Evidence of diphyletic origination of the Hadrosaruian in Dinosaur Systematics Approaches & Perspective Currie & Carpenter Chapter 13 Book: Dinosaurs under the Big Sky by Jack Horner 2001
  2. LordTrilobite

    Hadrosaur Humerus Repair/Prep

    I recently got this lovely mess of bone, which is a mostly complete hadrosaur right humerus that only requires some assembling. I actually bought this with the idea that it might be a fun project. But then it broke even more in the shipping. So I have my work cut out for me. It's from Judith River formation, Montana. It's hard to tell at the moment, but it seems to be a rather slender humerus. So that would make it more likely to be from the saurolophinae subfamily. But I will look into that some more when I have it assembled. So I will be doing lots of reassembling on this piece as well as prepping away some excess matrix that's still present. Besides the obvious problems, the bone itself is actually in very nice condition with some really smooth cortical bone as well as some lovely visible muscle scars. This is how it looked when I first opened it. Quite a mess. Also a drawing of what it should look like in context. And here I have slightly ordered the pieces. There's 5 big main pieces, three medium pieces and a whole bunch of tiny chunks. One of the bigger pieces that includes the ulnar and radial condyles. The shaft of the bone has had a pretty bad recent fracture. This is also where most of the smaller pieces come from.
  3. LordTrilobite

    Hadrosaur Humerus

    The right humerus of a subadult hadrosaur. The morphology matches that of saurolophinae. Members of Brachylophosaurini seem to match most closely. Brachylophosaurus canadensis is the closest match. There is some lateromedial crushing that makes the whole deltopectoral crest look more slender.
  4. LordTrilobite

    Hadrosaur Coracoid

    Left coracoid of a medium sized hadrosaur from the Judith River formation. Both lambeosaurine and saurolophine hadrosaurs are present in the Judith River formation. This coracoid is consistent with the morphology of saurolophine hadrosaurs. The closest match is Brachylophosaurus canadensis.
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