The images are sorted by Genus > Species. On each species gallery you can find some basic taxonomic info, images of wild specimens and a list with links to all known stocks from captive breeding. On each stock page you can find images of that stock and breeding info.
If you want to do a fast search, use the filters. You only have to start writing the genus or species you are looking for, select it when appears in the drop-down options and click the blue button "Apply".