I am currently working on finishing up a thesis about my research in the field of biochemistry. The text that I am using to describe the figures is italicized. My question is: when I am trying to mention the name of an animal species within the figure description that is already italicized, is it okay to keep the italic format for the species name, or change it to non-italic normal format? The species name is italicized all across the paper normally. For instance, you would see something like this in the paper (not in a figure description): "S. aeureus is a Gram-positive spherically shaped bacterium".
The two options for the figure description (that is in italic form) are:
"Figure 1. S. aeureus is a Gram-positive spherically shaped bacterium" (keeping the italic form of the name, but this no longer emphasizes the name of the species)
"Figure 1. S. aeureus is a Gram-positive spherically shaped bacterium" (the species name is no longer in italic form, making it different from the rest of the italicized sentence)
This is just an example. I couldn't find anything with regard to the rules in this kind of situation for scientific writing.