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Longrich & Saitta (2024) review the taxonomic status of Nanotyrannus and argue that multiple lines of evidence support it as a distinct, small-bodied, possibly non-tyrannosaurid taxon, rather than an immature form of Tyrannosaurus. [188] Mallon & Hone (2024) estimate that past sampling efforts likely resulted in sampling even the 99th ...
The sudden change in growth rate at the end of the growth spurt may indicate physical maturity, a hypothesis which is supported by the discovery of medullary tissue in the femur of a 16 to 20-year-old T. rex from Montana (MOR 1125, also known as B-rex).
The fastest growth rate is estimated to occur around 12–16 years of age, reaching 122 kg (269 lb) per year, based on a 1,300 kg (2,900 lb) adult, which is about a fifth of the rate for T.-rex. For Gorgosaurus , the calculated maximum growth rate is about 110 kilograms (240 lb) during the rapid growth phase, which is comparable to that of ...
It appears this Tyrannosaurus was about 13-15 years old, two-thirds adult size, 25 feet (7.6 meters) long and 3,500 pounds (1,600 kg). T. rex was fully grown at around 18-21 years.
The smallest phytosaur femora reported to date are described from the lower Chinle Formation at Petrified Forest National Park (Arizona, United States) by Goldsmith et al. (2024), who interpret one of the studied femora as belonging to a post-hatching individual that may have died within the first year of its life, with slower growth rate than ...
Tyrannosaurus rex is drawn in black. Based on Erickson et al. 2004. Tyrannosaurus rex showed a "teenage growth spurt": [56] [57] ½ ton at age 10; very rapid growth to around 2 tons in the mid-teens (about ½ ton per year). negligible growth after the second decade.
Freddie Mac reports an average 6.78% for a 30-year fixed-rate mortgage, down 1 basis point from last week's average 6.79%, according to its weekly Prime Mortgage Market Survey of nationwide ...
Skeletal mount of the Tyrannosaurus holotype.. This timeline of tyrannosaur research is a chronological listing of events in the history of paleontology focused on the tyrannosaurs, a group of predatory theropod dinosaurs that began as small, long-armed bird-like creatures with elaborate cranial ornamentation but achieved apex predator status during the Late Cretaceous as their arms shrank and ...