Well, everyone is correct,as no one knows what causes this. All the siblings had normal Carapace scutes. I will say that in 20+ years of hatching these,this is the first one I've ever seen where the centrals are missing altogether and the costals exstending over the top of the shell. I was hoping it would at least get people on here talking but I guess the tortoise forum is a thing of the past. Se ya no where no one. Civ