A giant, ostrich-like dinosaur and its smaller cousin, also an ornithomimosaur, sprinted through what is now Mississippi about 85 million years ago.
Two ostrich-like dinosaurs — a towering paleo-beast that was among the largest of its kind, and its smaller, fierce cousin — sprinted through what is now Mississippi about 85 million years ago, during the Cretaceous period, new fossil finds reveal.
The fossils also document"the youngest occurrence of ornithomimosaurs in Appalachia," Tsogtbaatar told Live Science in an email. These omnivores ranged greatly in size, from the colossal Deinocheirus, which stood as tall as a three-story building and measured about 36 feet long, to pup-size pip-squeaks that were smaller than 3 feet long, such as Nqwebasaurus and Pelecanimimus, said Tsogtbaatar, who is also at the Paleontology Research Lab at the North Carolina Museum of Natural Sciences.
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Giant ostrich-like dinosaurs give us a glimpse of ancient North AmericaThe enormous ostrich-like bird flocked through the eastern part of North America during the Cretaceous period.
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Large-bodied ornithomimosaurs inhabited Appalachia during the Late Cretaceous of North AmericaReconstructing the evolution, diversity, and paleobiogeography of North America’s Late Cretaceous dinosaur assemblages require spatiotemporally contiguous data; however, there remains a spatial and temporal disparity in dinosaur data on the continent. The rarity of vertebrate-bearing sedimentary deposits representing Turonian–Santonian ecosystems, and the relatively sparse record of dinosaurs from the eastern portion of the continent, present persistent challenges for studies of North American dinosaur evolution. Here we describe an assemblage of ornithomimosaurian materials from the Santonian Eutaw Formation of Mississippi. Morphological data coupled with osteohistological growth markers suggest the presence of two taxa of different body sizes, including one of the largest ornithomimosaurians known worldwide. The regression predicts a femoral circumference and a body mass of the Eutaw individuals similar to or greater than that of large-bodied ornithomimosaurs, Beishanlong grandis, and Gallimimus bullatus. The paleoosteohistology of MMNS VP-6332 demonstrates that the individual was at least ten years of age (similar to B. grandis [~375 kg, 13–14 years old at death]). Additional pedal elements share some intriguing features with ornithomimosaurs, yet suggest a larger-body size closer to Deinocheirus mirificus. The presence of a large-bodied ornithomimosaur in this region during this time is consistent with the relatively recent discoveries of early-diverging, large-bodied ornithomimosaurs from mid-Cretaceous strata of Laurasia (Arkansaurus fridayi and B. grandis). The smaller Eutaw taxon is represented by a tibia preserving seven growth cycles, with osteohistological indicators of decreasing growth, yet belongs to an individual approaching somatic maturity, suggesting the co-existence of medium- and large-bodied ornithomimosaur taxa during the Late Cretaceous Santonian of North America. The Eutaw ornithomimosaur materials provide key information on the diversity and
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