Wrong tortoise shell refers to the irregular arrangement, loss or increase of tortoise shell, which leads to ugly turtle back and is generally very unpopular. Some turtle dealers will declare that they don't accept turtles with the wrong armor when they buy turtles. It is difficult to sell the wrong tortoise, so the price will be very low and it is not worth breeding.
In the process of hatching, there are turtles with abnormal arrangement or lack of shields at birth due to gene mutation or genetic genes. Turtles with this phenomenon can't recover their original appearance and grow slowly.