Countries with the Most Reptile Species

I don't doubt your good faith, but I'm pretty sure your source is wrong. You can see the species richness dot plot chart in this pdf: https://www.sanbi.org/wp-content/uploads/2018/04/tolley-et-al-2016-african-reptile-conservation.pdf

Guinea seems to have about the same number of reptile species as Ivory Coast, i.e. well under 100. I can't find anything else on the Internet to back up your source.

(my best guess is that they've scanned another database for the word "Guinea", and added together all the species that appear for Papua New Guinea, Guinea, and Equatorial Guinea)