coura;4573193; said:You pretty much nailed it, it seems to be a cumberland and yes it inst for shure a yellow belly slider. However the plastron of cs and res can be practicly equal in the hatchling state, depending on the individual turtle and cant be used as a shure sign to identify subspecies. Many ybs as well dont have plain yellow plastrons, many have spots.
I was thinking of the marginals, in particular how the markings on the underside appear. Usually, the spaces between the spots are wider than the spots themselves. This specimen's spots aren't even separated. You are correct about the plastron though, the main part of the plastron is usually pretty similar between both troostii and elegans.