You can call them Dionaea SG for now. The cool thing is that if you grow out some special flytraps, you can name them yourself in the future, and even registered the cultivar name!
If there are definitely rooted segments (and it looks like it in the picture), they usually "peel" away easily with your fingers. If it takes any real force, it's not ready to split.
Thanks @Lloyd Gordon and @Carson Hardy for the comments. These one detached themselves when repotted... Have got so many baby plants, about 30 in total, from a grocery purchase mother's plant 2 years ago.