annectens (duck bill dinosaur) Maxilla Jaw Section
Superorder Dinosauria, Order Ornithischia, Suborder Cerapoda, Superfamily
Hadrosaurodea, Family Hadrosauridae, Subfamily Hadrosaurinae (genus Edmontosaurus,
Time: Late Cretaceous (70 million years ago)
cm in length by 13 cm high by 10 cm wide (14 3/4 x 5 1/8 X 3 15/16”)
Hell Creek Formation, Perkins County, Montana
This large solid jaw section is in a wonderful state of preservation.
The bone of the jaw shows amazing detail, including cellular structures.
The teeth are life-like with a deep chocolate color. There are approximately
36 mature teeth showing. You’ll notice that the inner and
outer sections of the teeth show different tooth types, sizes and
growth stages. Note the ornamentation lines of the jaw. Upon discovery,
it was found in a few, large broken segments. A highly qualified
and professional preparator performed the curation.
The hadrosaurs are known as the duck-billed dinosaurs due to the
similarity of their head to that of modern ducks. In some species,
most notably Anatotitan,
the whole front of the skull was flat and broadened out to form
a beak, ideal for clipping leaves and twigs from the forests of
Asia, Europe and North America. However, the back of the mouth contained
literally thousands of teeth suitable for grinding food before it
was swallowed. Hadrosaurs, like their iguanodontian cousins, had
a rudimentary dental specialization analogous to incisors and molars.
Scientists hypothesize that this was a critical characteristic for
the success of Edmontosaurus compared with sauropods that were still
largely dependent on gastroliths for grinding their food.
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