why does it appear that, for most genera of dinosaur, there is only one described species?

Question

why does it appear that, for most genera of dinosaur, there is only one described species?

In: 5

Answer 1

A lack of fossils, most likely. We don’t have enough evidence to determine what is variation within a species and what constitutes different species. For example, there’s a theory right now that there are actually [three species of Tyrannosaurus](https://www.sci.news/paleontology/three-tyrannosaurus-species-10590.html) rather than one, but it’s contentious because the sample size is so small.