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Duckbill scapula
have been found with numerous gastroliths in their stomachs
it is not considered a true member of the group in the narrow sense
flexible neck
Dinosaur speeds are estimated using their morphology (characteristics like leg length and estimated body mass) and fossilized trackways
Mesosaurus braziliensis, framed Spinosaurus Duckbill scapulaBeautiful plaque preserving a unique water dwelling early reptile form. Known from only South America and Africa, this distribution of Mesosaurus supports the understanding that these great continents were once joined together; Mesosaurus could easily swim rivers from one continent to another but salty oceans would have thwarted the freshwater creature from crossing an existing ocean. Mesosaurus sp. Early Permian (280 m. y. a.) Irati Formation Sao
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