Researchers from China, Japan, and Germany studied the fossil remains of Keichousaurus, a 240-million-year-old Triassic-period marine reptile.
The scientists were able to distinguish various traits of Keichousaurus male and female based only on the differential fossilized bone structures.Furthermore, adult male Keichousaurus possessed stronger upper arm bones than females. The humerus bone of a male appears triangular in cross-section, while that of a female looked round-oval.
Using growth curves, the scientists hypothesize that such bone shifts happened when the Keichousaurus was one year old.
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