Evolution is adaptation to the environment and other changes. Not everything about a creature must change, especially if nothing or very little about the environment changes. Sometimes nothing changes.

To address your actual picture, where does that quote come from? "Between a million to 10,000 years." Age dating is far more precise than that, going to need a source. Also going to need a source on the pictures and various expert's opinions and rationale. You know, things we can test and falsify.

In contrast here is a 50 part video series detailing the systematic classification of life, with facts and evidences you can easily look up and verify yourself, as opposed to a shitty image that means nothing: https://www.youtube.com/watch?v=AXQP_R-yiuw&list=PLXJ4dsU0oGMLnubJLPuw0dzD0AvAHAotW