Search the Community
Showing results for tags 'sexual dimorphism'.
Hi everyone. I would expose a paleontological ID question that intrigues me. Let me do it in a storytelling style. Prologue Last November I found this beautiful bug in a limestone Upper Campanian /Lower Maastrichtian strata in the SE of Pyrenees, Catalonia (Spain). So, I start a little detective process... which turned not to be so little. This cidaroid specimen is almost complete, retaining even its plates, which is rather rare. In fact, its plates are of most importance in this story. Chapter
A paleontologist at the Canadian Museum of Nature is countering decades of studies that assert that some dinosaurs can be identified as male or female based on the shapes and sizes of their bones. A study was conducted on non-avian dinosaurs like Tyrannosaurus rex, Allosaurus fragilis, Stegoceras and Stegosaurus to determine if sexual dimorphism existed. The study included tests and concluded that no evidence for sexual dimorphism was found in any of the examined taxa, contrary to conventional wisdom. This is not to say that dinosaurs were not sexually dimorphic, only that the available evi