Although all ants Pheidole genus because of their genetic material can become a "super-soldiers", however, such "caste" is rarely found in nature.
Ant "super-soldier" has a huge head that blocks the entrance to his home, while he was fighting for it like no other. Only two species of this genus are able to grow naturally. However, the researchers found that all the ants of the genus Pheidole have genetic material that helps the development of "super-ant." The study showed that all these ants had a common ancestor, which gave them the corresponding gene.
Obviously, such a super-ants genetically acquired that within their species rarely appears, and then accidentally.
Most species of the genus Pheidole ants have two types of castes except the queen: the workers and soldiers. This genus of ants is the most numerous, while there are about 1,100 of its species worldwide.
Source:
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