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Dr. Tom Holtz and Dr. Michael K. Brett-Surman
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Which is bigger, Allosaurus fragillis or Allosaurus maximus?I would assume it would be maximus since it has "maximus" in its name and how big did they each get?
from J, age 16, Atlanta, Georgia, America; July 26, 2001

TOM: Actually, it is not at all certain that Allosaurus maximus is a real species. Many paleontologists think that the remains of this creature are just very big individuals of A. fragilis. There are remains of allosaurid individuals in the Morrison Formation that indicate a creature in the range of 12-13 m or so (40-43 feet), which is comparable in length to Tarbosaurus and Tyrannosaurus. Whether these dinosaurs are just very big individuals of Allosaurus fragilis, whether they should be considered their own genus and species (Saurophaganax maximus), or whether they are their own species within Allosaurus (A. maximus) is a matter of debate.

If the A. maximus specimens are a distinct species, then A. fragilis seems to top out at around 10 m (33 feet).


Back to the Holtz and Brett-Surman Questions

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