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a change in temperature
Duckbill skin
six hip vertebrae
by striking downward with the sharp downward spike at the front of its upper beak
China Age: Late Miocene
Placenticeras meeki, ammonite Deinonychus a change in temperaturePlacenticeras meeki is an extinct Ammonite distinguished by its smooth convex, broad, nearly unornamented sides and smooth venter (its outside edge). Placenticeras meeki ranged in size up to 80 centimeters in diameter (about 32 inches) as opposed to Placenticeras intercalare which reaches up to 25 centimeters in diameter (about 10 inches). All Placenticeras species have a moderately involute umbilicus (the central whorl or spiral). Involute means
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